Jillian
Feminine
Jillian is overwhelmingly a girls’ name — 83,197 girls against 227 boys since 1880.
Jillian is the American spelling of Gillian, and Gillian is what medieval English did to the Latin name Julianus — the Roman original worn smooth by centuries of English mouths. The name was so ordinary in the Middle Ages that "jill" became a plain English word for a girl or sweetheart, the one that pairs with Jack in the old rhyme. Said aloud it still has that easy three-beat ripple, with the short form waiting inside it.
How old is the name Jillian?
Jillian first appears in US birth records in 1944 — 81 years ago. The typical Jillian alive today was born around 1994, making them about 31 years old. About 81,500 people named Jillian are estimated to be alive in the US today.
When was the name Jillian most popular?
Jillian peaked in 1982, reaching #96 nationally. Today it ranks #1261, 1,165 places below that high. See the whole 1982 chart.
Jillian appears on this list:
Where it comes from
From Julius to Jillian
The story of Jillian
The Roman family name Julius produced Julianus, and Julianus traveled into English as Julian, used for men and women alike in the Middle Ages. English speakers softened the opening consonant, and by the medieval period Gillian was one of the most ordinary women's names in the country — common enough that "gill" or "jill" worked as a generic word for a girl. The J spelling is largely an American development of the twentieth century, matching sound to letter for readers who might otherwise try a hard G. Jillian and Gillian are the same name, arrived at from two directions.
Meaningscholars disagree
Descended from the Roman name Julius — often read as "youthful"
Jillian traces to Julianus, "of Julius." What Julius itself meant is the open question: one reading connects it to Greek ioulos, "downy-bearded," and so to youth; another links the Julian family name to Jove, the god Jupiter. Both are seriously held, and neither has won.
How the name formed
- Julius
- Julianus
- Juliana
- Gillian
- Jillian
Related forms: Gillian · Juliana · Giuliana · Julienne · Juliane · Yuliana
Pronouncing Jillian
JIL-ee-uhn
Three syllables, stress on the first. Many speakers compress the middle and say JIL-yuhn; both are standard, and no one will correct either.
Nicknames for Jillian
High
What the data says
146 years of official birth records
The long climb, and where it stands now
The same years in position rather than babies
- First recorded
- 1944
- Most girls named
- 20012,847 — the highest on record
- Peak rank
- #96reached in 1982
- Change vs 2023
- −17.3%177 in 2025, from 214
Rank is a position, a count is a headcount, and they move independently — a name can hold its rank while the number of babies behind it falls. Source: U.S. Social Security Administration.
Jillian in other languages
The same name elsewhere
- Gillian in English (British) — spelling variant
- Juliana in Latin / Spanish — same name
- Giuliana in Italian — same name
- Julienne in French — same name
- Juliane in German — same name
- Yuliana in Russian — transliteration
Strongest US states over the last decade: Texas, California, New York.
Jillians among us
people named Jillian are estimated to be alive in the US today
About 1 girl in 9,081 born in 2025 was named Jillian
Estimated from SSA birth records and published actuarial life tables. Method
Is it right for you
What happens to a name after it peaks
The Inez test
Every popular name lives one long story — a climb, a peak, a slow settling back. Jillian's later chapters haven't been written yet, so we borrowed them: Inez climbed just as high around 1909, and its whole arc is on record. Line the two peaks up, and Inez's path sketches the road Jillian is walking now.
Jillian 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 scored estimate from 146 years of naming cycles — not a prophecy. Great names outlive statistics. How this is scored
Where Jillian is headed
Jillian is easing off slowly — about 16% fewer babies a year by 2030 if the trend continues.
Medium confidence — fitted on official counts through 2025.
A damped-trend projection of the official birth data — a sketch of momentum, not a promise. Every name's forecast, ranked.
Jillian beside its neighbors
The names ranked closest to Jillian in 2025, in babies rather than position — the bars are to scale.
US girls given each name in 2025.
The trade-off
- Jill is a ready-made short form with centuries of independent use, so the nickname needs no explaining.
- The J spelling tells English readers exactly how to say it — no hard-G ambiguity at the first reading.
- Sits in a large, well-known family — Julia, Juliana, Julian, Gillian — which helps if you are matching a relative's name.
- A documented line back to Roman naming, unbroken through medieval England into modern American use.
- Gillian sounds identical and is the standard British spelling, so expect to spell it out over the phone and to be handed the other version now and then.
- Jill arrives whether you invite it or not. If you dislike the short form, it is worth knowing that most classmates and coworkers will reach for it.
- It is far better represented among grown women than among children being named now, so a young Jillian will likely meet adults who share the name before she meets any peers who do.
Nobody names a baby alone.
Put Jillian to the vote.
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What they receive
Someone added a name to your list
Jillian
Feminine · #1261 in the U.S.
Frequently asked
- How many Jillians are there in the world?
- No country counts the world's names, so there is no worldwide figure — anyone quoting one is estimating. About 81,500 people named Jillian are estimated to be alive in the US today.
- How popular is the name Jillian in 2025?
- Jillian ranks #1261 among US girl names in 2025, with 177 babies given the name.
- How rare is the name Jillian?
- About 1 in every 9,081 US girls born in 2025 was named Jillian — 177 in all.
- Will my child share the name Jillian with classmates?
- Jillian will almost certainly be the only one in school.
Ranked beside Jillian
Names sitting at a similar level of popularity right now.
Ariela#1261 · Tillie#1261 · Alba#1261 · Heather#1261 · Isadora#1261 · Marlene#1261 · Areli#1261 · Karolina#1261
Looking for what else is popular rather than what resembles Jillian? See the current top 100.
Choosing between Jillian and another name?
See them side by side — full stats, history and a gentle verdict.
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US figures from the Social Security Administration. 1880–2025. Data & methodology
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