Head to head · Boys' names
Jasai vs Julius
#439 vs #424 in 2025
Julius is a whisker ahead (#424 vs #439 in 2025), but the curves point different ways: Julius is stepping back from its peak, Jasai is climbing the charts fast. On momentum, Jasai has the edge.
Cast your vote
Which one would you pick?
Your gut first, the numbers after — the split shows once you pick.
The tale of the tape
On the charts, Julius leads 5 measures of 6; Jasai leads 1.
Ranks, counts and years are measured in the official US birth record; the classroom and living figures are estimates computed from it. The dot marks the side each measure favours on the charts — more common, not better.
What the records say
146 years of US births, drawn on one scale
Two curves, one scale
Who owned which decade
- 1880s: Jasai —, Julius #94 — Julius higher
- 1890s: Jasai —, Julius #103 — Julius higher
- 1900s: Jasai —, Julius #108 — Julius higher
- 1910s: Jasai —, Julius #108 — Julius higher
- 1920s: Jasai —, Julius #147 — Julius higher
- 1930s: Jasai —, Julius #205 — Julius higher
- 1940s: Jasai —, Julius #258 — Julius higher
- 1950s: Jasai —, Julius #315 — Julius higher
- 1960s: Jasai —, Julius #386 — Julius higher
- 1970s: Jasai —, Julius #409 — Julius higher
- 1980s: Jasai —, Julius #368 — Julius higher
- 1990s: Jasai —, Julius #479 — Julius higher
- 2000s: Jasai #6152, Julius #366 — Julius higher
- 2010s: Jasai #3768, Julius #334 — Julius higher
- 2020s: Jasai #1538, Julius #369 — Julius higher
Julius stood higher in every recorded decade — 15 of 15.
Rank by decade
| Decade | Jasai | Julius |
|---|---|---|
| 1880s | — | #94 |
| 1890s | — | #103 |
| 1900s | — | #108 |
| 1910s | — | #108 |
| 1920s | — | #147 |
| 1930s | — | #205 |
| 1940s | — | #258 |
| 1950s | — | #315 |
| 1960s | — | #386 |
| 1970s | — | #409 |
| 1980s | — | #368 |
| 1990s | — | #479 |
| 2000s | #6152 | #366 |
| 2010s | #3768 | #334 |
| 2020s | #1538 | #369 |
Average national rank across each decade. A dash means the name sat outside the recorded top of that decade.
The names themselves
Meaning, roots, sound and the people who carried each
Where each name comes from
Jasai
Not established
No established meaning. What is documented is the name itself: a boy's name in US records, formed from elements that recur widely in American naming — the Ja- opening shared with Jamal, Javon and Jaden, and an ending that echoes Isai and Isaiah. Whether any one bearer's family intended that connection is not something the record captures.
Our story of Jasai — where the record runs out
Jasai comes into the record without a paper trail, which is its own kind of fact: somebody made it, fairly recently, and other families liked it enough to make it again. Its first syllable belongs to one of the most productive families in American naming — the Ja- names that parents have been inventing and reinventing for decades — and its ending lands on the same rising vowel as Isai and Isaiah.
Julius
Roman family name, traditionally linked either to Jupiter or to Greek ioulos, 'downy-bearded, youthful'
Two readings compete. One connects Iulius to Jove/Jupiter, by way of Iulus, the ancestor from whom the Roman gens Julia claimed descent. The other derives it from Greek ioulos, meaning down or the first soft beard, hence 'youthful'. The name is old enough that its origin was already obscure to Romans themselves, and neither reading has won.
Iulius (Latin) → Julius → Iulianus / Julian → Julia → Jules
How it traveled
Iulius was the name of one of Rome's patrician clans, the gens Julia, whose most famous member reshaped the Roman state in the first century BC and left his name on the calendar and on the month of July. As a clan name it passed to thousands of Roman citizens, then survived the empire's collapse through Christian bearers — Pope Julius I in the fourth century, and later Julius II, the pope who commissioned the Sistine Chapel ceiling.
Where a reading is contested the note says so — this page does not turn a guess into a fact. The chain is each name's recorded forms, oldest first; the story is its opening, told in full on the name's own page.
Out loud, and in short
Jasai
juh-SYE
Stress falls on the second syllable. Both juh-SYE (rhyming with Isai) and juh-SAY are heard, and no single version has settled as the standard, so whichever the family chooses will need saying out loud at first meetings.
- Jay — The obvious short form, and a long-established given name in its own right for men of every generation.
- Sai — Takes the stressed half of the name; also stands alone as a given name in several unrelated traditions.
- JJ — Informal, and generally depends on a J surname or middle name to justify the second letter.
Julius
JOO-lee-us
Three syllables, stress on the first. In German, Danish and Finnish it is closer to YOO-lee-oos, which is worth knowing if the family has ties to those languages.
- Jules — The most widespread short form; also a full given name in its own right in French, and increasingly used as a nickname for girls named Julia or Juliette.
- Jay — Informal, English-speaking; a first-initial nickname that works on a playground and on a roster.
- Juju — Family-and-toddler register, rarely used past childhood.
- Julle — Informal Swedish and Danish short form, mostly among friends rather than in writing.
One short form, two names
- Jasai and Julius both shorten to Jay.
Short forms as recorded on each name’s own page. This is here so it is a decision rather than a discovery.
Is it right for you
The differences that decide it, laid out by what you want
Choose by what you want
Choose Jasai if you want…
- a name fewer children share#439 in 2025 — jasai will almost certainly be the only one in school
- a name on the way upup 1,702 places on the charts in five years
- a newer arrivalJasai entered the US charts in 2002
- a name that feels very nowJasai is climbing the charts fast
Choose Julius if you want…
- a name most people already know#424 in 2025, 759 babies that year
- a name past its most crowded yearsJulius is stepping back from its peak
- a long American recordJulius was already in use when US records began in 1880
- a name that ages quietlyan estimated 40% chance of feeling dated by 2040, against 65% for Jasai
Each line is a measured difference between the two names — a rank, a count, a recorded form — never a judgement of either. Save the one that answers your question; it lands on your shortlist.
The trade-offs, name by name
Jasai
Strengths
- Jay, the natural short form, is a familiar standalone name that any teacher, coach or employer already knows how to spell.
- The Ja- opening is a pattern Americans read at a glance, so the name looks intended rather than mistyped even on first sight.
- Short and end-stressed — two syllables that carry across a playground without needing to be shouted.
To consider
- The pronunciation genuinely isn't settled — juh-SYE and juh-SAY both circulate — so your child will correct people, gently and often, for life. Choosing one and saying it clearly from the start is most of the work.
- Spelling will need to be given out letter by letter. Jasiah, Jaisai and Isai all sit close enough to catch a listener who is only half paying attention.
- There is no meaning to offer when someone asks, which comes up more than parents expect. What you can say instead is where the sound comes from, and that it was chosen rather than inherited.
Julius
Strengths
- Spelled the same way for two thousand years, and readable on sight to anyone literate in English — no correcting, no alternate spellings competing for attention.
- Travels without translation: Julius in German, Danish and Finnish, Julio, Giulio and Jules just next door.
- Has an established short form, Jules, plus the simple Jay — so there is a casual option without inventing one.
To consider
- Julius Caesar is unavoidable. Most American students meet the Shakespeare play in high school, which means a few Ides-of-March jokes and possibly a lifetime of 'Hail, Caesar.' Mild, but constant.
- Its American history is weighted toward older generations, so some relatives may hear it as a name from their grandfathers' era rather than a current one.
- Expect Julian and Julio to be offered as corrections, since all three are close in sound and far more common in some regions.
Documented properties of each name — how it spells, travels and shortens — not opinions about the child.
How each is likely to age
Jasai
65%chance Jasai feels dated by 2040
Jasai is climbing fast right now. Steep climbs tend to come with steep descents — the quicker a name arrives, the more firmly it belongs to its moment.
Julius
40%chance Julius feels dated by 2040
Julius sits in the calm middle of the cycle — neither chasing a wave nor sliding off one. Middle-of-the-cycle names age slowly and predictably.
A reading of where each name sits on the long naming cycle — computed, not measured, and explained on the data page.
With your last name
Say both in full. The notes are facts about letters and sound — a rhyme, a shared initial, the monogram — not a verdict on either name.
Type a last name to hear Jasai and Julius in full.
Weighing the whole shortlist? Run the full comparison — up to eight names with your last name, initials, classroom projections and a printable report.
Decide together
Nobody names a baby alone
Still torn between Jasai and Julius?
Put both to the vote.
One link to your partner, your parents, your sister. Each of them gets the two names, a one-tap answer and room to say why — and every reply lands in one place.
Free to start · no account needed · everyone you invite votes in one tap
More than two in the running? Settle it with a bracket or run the full comparison with your last name.
More head-to-heads
Same measures, different pair. Sixty more are dealt daily in the arena.
Lists these names appear on
- One-decade wonders
- Victorian names ready for a second century
- Ancient Roman names in modern use
- Names that belong entirely to the 1880s
- all guides
Where Jasai and Julius each sit in the library — alternatives in the same style, ranked by the same records.
Jasai or Julius — the short answers
- Which is more popular, Jasai or Julius?
- Julius, in 2025: Julius ranked #424 with 759 babies; Jasai ranked #439 with 719 babies.
- Which name is rising faster, Jasai or Julius?
- Jasai. Over the last five years Jasai moved up 1,702 places; Julius moved down 89 places.
- Which is the older name, Jasai or Julius?
- Jasai entered the US charts in 2002; Julius was already in use when US records began in 1880. On the American record, Julius is the older name.
- How many people are named Jasai and Julius?
- About 1,600 people named Jasai are estimated to be alive in the US today. About 47,000 people named Julius are estimated to be alive in the US today.
- Do Jasai and Julius share a nickname?
- Yes — both shorten to Jay, so in a house with both names the short form would not say which child is meant.
US figures from the Social Security Administration, 1880–2025. Votes are battle voters on this site, not the birth record. Data & methodology
Keep playing
Sixty more head-to-heads are dealt in the arena every day — or line up Jasai, Julius and the rest of your shortlist with your last name in one printable report.
Free to start · no account needed · everyone you invite votes in one tap