Head to head · Boys' names
Izaiah vs Leonard
#635 vs #637 in 2025
Izaiah is a whisker ahead (#635 vs #637 in 2025), but the curves point different ways: Izaiah is stepping back from its peak, Leonard is holding its place on the charts. On momentum, Leonard 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, Leonard leads 3 measures of 6; Izaiah leads 2.
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: Izaiah —, Leonard #78 — Leonard higher
- 1890s: Izaiah —, Leonard #63 — Leonard higher
- 1900s: Izaiah —, Leonard #50 — Leonard higher
- 1910s: Izaiah —, Leonard #44 — Leonard higher
- 1920s: Izaiah —, Leonard #39 — Leonard higher
- 1930s: Izaiah —, Leonard #52 — Leonard higher
- 1940s: Izaiah —, Leonard #62 — Leonard higher
- 1950s: Izaiah —, Leonard #89 — Leonard higher
- 1960s: Izaiah —, Leonard #121 — Leonard higher
- 1970s: Izaiah —, Leonard #164 — Leonard higher
- 1980s: Izaiah #5955, Leonard #230 — Leonard higher
- 1990s: Izaiah #2366, Leonard #391 — Leonard higher
- 2000s: Izaiah #509, Leonard #595 — Izaiah higher
- 2010s: Izaiah #482, Leonard #649 — Izaiah higher
- 2020s: Izaiah #568, Leonard #665 — Izaiah higher
Leonard stood higher in 12 of 15 decades; Izaiah has held the lead since the 2000s.
Rank by decade
| Decade | Izaiah | Leonard |
|---|---|---|
| 1880s | — | #78 |
| 1890s | — | #63 |
| 1900s | — | #50 |
| 1910s | — | #44 |
| 1920s | — | #39 |
| 1930s | — | #52 |
| 1940s | — | #62 |
| 1950s | — | #89 |
| 1960s | — | #121 |
| 1970s | — | #164 |
| 1980s | #5955 | #230 |
| 1990s | #2366 | #391 |
| 2000s | #509 | #595 |
| 2010s | #482 | #649 |
| 2020s | #568 | #665 |
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
Izaiah
Yahweh is salvation
From the Hebrew Yesha'yahu, joining a verb of saving or deliverance to the divine name. The respelled form carries the meaning of Isaiah unchanged.
Yesha'yahu → Esaias → Isaias → Isaiah → Izaiah
How it traveled
The name begins in Hebrew as Yesha'yahu, borne by the prophet whose oracles fill the Book of Isaiah, active in Jerusalem in the eighth century BC. Greek translators of the Hebrew Bible rendered it Esaias, Latin turned that into Isaias, and English settled on Isaiah — a form that spread widely among English-speaking Protestants after the Reformation put the Bible in ordinary hands.
Leonard
lion, hardy
Two elements: the word for the lion, which Germanic borrowed from Latin, and a Germanic word meaning hardy or brave which closes a long list of names. The reading is settled. What is worth separating is the name from Leon: the first element is shared and nothing else is, and the two arrived in English by entirely different roads.
A Latin word for the lion borrowed into Germanic → Joined to a Germanic element meaning hardy → Leonard across France, Germany and England → Very widely used in early twentieth-century America
How it traveled
The most famous bearer had no surname. In fifteenth-century Tuscany ordinary people were identified by a first name and a place or a father's name, and the painter from the village of Vinci was called exactly that: Leonardo from Vinci, which is a description rather than a family name.
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
Izaiah
eye-ZAY-uh
Three syllables, stress on the middle. The spelling makes the z sound explicit — the same sound most English speakers already give Isaiah.
- Izzy — The most common short form; informal, and also used for Isabella, Isabel, Israel and Isidore, so it rarely points to one name alone.
- Zay — Informal, current among younger bearers; shared with Xavier and Zayden.
- Zaiah — Informal clipping that keeps the ending intact; sometimes written as a given name in its own right.
- Ike — Older-style short form drawn from the same family of biblical I- names; uncommon today.
Leonard
LEN-erd
Two syllables in ordinary English speech, with the first vowel reduced from the three syllables the spelling suggests. Italian and Spanish give it four with the stress on the third, which makes the same name sound considerably grander.
- Len — The universal English short form, flat and completely unpretentious.
- Leo — The front, which is a complete name and currently extremely fashionable.
- Nardo — The back, which is the Italian and Spanish clipping and sounds nothing like the front.
Is it right for you
The differences that decide it, laid out by what you want
Choose by what you want
Choose Izaiah if you want…
- a name past its most crowded yearsIzaiah is stepping back from its peak
- a name with more sound in itIzaiah runs 3 syllables, Leonard 2
- a newer arrivalIzaiah entered the US charts in 1984
- a name that feels very nowIzaiah is stepping back from its peak
Choose Leonard if you want…
- a name with fewer syllablesLeonard is 2 syllables to Izaiah's 3
- a long American recordLeonard was already in use when US records began in 1880
- a name that ages quietlyan estimated 12% chance of feeling dated by 2040, against 40% for Izaiah
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
Izaiah
Strengths
- The meaning is settled and needs no hedging: Yahweh is salvation, from a name documented for well over two thousand years.
- Sounds identical to Isaiah, so anyone who hears it knows how to say it immediately.
- Has real short forms already in use — Izzy, Zay, Zaiah — rather than none at all.
To consider
- The default spelling is Isaiah, and that is what most people will write first. Expect a lifetime of small corrections on forms, rosters and coffee cups.
- Because the z form is recent, it carries none of its own paper trail — searches, older records and reference books will all point back to Isaiah.
- Izzy is shared with a crowd of other names, so a nickname may not identify him on its own.
Leonard
Strengths
- It is used unchanged across most of Europe and needs no translation anywhere.
- Len and Leo are two very different short forms and both stand alone.
- It has a documented meaning and an unbroken record of many centuries.
To consider
- It is strongly associated with an earlier American generation, though it is returning.
- English reduces it to two syllables where the continental forms keep four.
- The spelling is on the register for girls as well, in very small numbers.
Documented properties of each name — how it spells, travels and shortens — not opinions about the child.
How each is likely to age
Izaiah
40%chance Izaiah feels dated by 2040
Izaiah 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.
Leonard
12%chance Leonard feels dated by 2040
Leonard has held the top-100 across 8 different decades — it has never depended on fashion, and names like that read the same at any age.
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 Izaiah and Leonard 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 Izaiah and Leonard?
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 that carry both names
Every list here names both Izaiah and Leonard — the same style, ranked by the same records.
Izaiah or Leonard — the short answers
- Which is more popular, Izaiah or Leonard?
- Izaiah, in 2025: Izaiah ranked #635 with 439 babies; Leonard ranked #637 with 438 babies.
- Which name is rising faster, Izaiah or Leonard?
- Neither is rising. Over the last five years Izaiah moved down 147 places; Leonard moved down 2 places.
- Which is the older name, Izaiah or Leonard?
- Izaiah entered the US charts in 1984; Leonard was already in use when US records began in 1880. On the American record, Leonard is the older name.
- How many people are named Izaiah and Leonard?
- About 14,500 people named Izaiah are estimated to be alive in the US today. About 124,000 people named Leonard are estimated to be alive in the US today.
- Will there be other Izaiahs or Leonards in the classroom?
- Izaiah will almost certainly be the only one in school. Leonard will almost certainly be the only one in school.
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 Izaiah, Leonard 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