Jillyn
Girls' nameMeaning not yet documented
Jillyn has been given to 171 babies in the U.S. since 1950. It was used fewer than 5 times in 2025, so it doesn't appear in the latest year's list — today it's a genuinely uncommon pick. Its peak year was 1976, with 10 recorded.
Babies named Jillyn, 2002
1 in 747,000
Jillyn over time, 1880–2025
Based on births in the U.S. Babies given the name each year. Hover the chart — or focus it and use the arrow keys — for any year. Gaps mean the name was given fewer than 5 times that year; these counts are unpublished.
How common is Jillyn?
Jillyn had fewer than 5 recorded uses in 2025, so these figures use 2002, the last year it was published.
- Among all babies, 2002
- 1 in 747,000
- 5 of 3,737,275 births
- Among girls only
- 1 in 359,000
- <0.01% of girls
- Rank, 2002
- Unranked
- Fewer than 5 uses
- Coin-flip room size
- 518,097 kids
- Even odds of a second one
Where Jillyn sits on the popularity scale
Chance at least one other child shares the name
If the other children were drawn at random from the 2002 national name distribution. Real classrooms cluster by region and community, so treat these as a floor, not a ceiling.
Put another way: gather 518,097 children born in 2002 and it's an even bet that one of them is another Jillyn. In a class of 30 the chance is Under 1%.
When Jillyns were born
Half of everyone ever recorded as Jillyn was born before 1976 — so the typical Jillyn is around 49 today.
- Biggest decade
- 1970s
- 33.3% of all use
- Born in the last 25 years
- 44.4%
- Spread across generations
- Recorded since 1950
- 171
- People you could plausibly meet
1970s — 33.3% of all recorded uses (57).
Is Jillyn rising or falling?
Rank movement and count movement can disagree — the number of distinct names in use keeps growing, so a name holding a steady count still slides down the list. Both are shown.
- Rank vs 1 year ago
- —
- Not ranked then
- Rank vs 5 years ago
- New entry
- Not ranked then
- Rank vs 10 years ago
- —
- Not ranked then
- Births vs 10 years ago
- —
- Not published both years
- Share of its own peak
- 0%
- Peak was 1976 (10)
- Years since peak
- 49
- Years
- Year-to-year steadiness
- Volatile
- 26.6% average annual change
Spellings of Jillyn
Jillyn is not the most common spelling — Jill is, with 40.2% against Jillyn's 0.03%.
Grouped by closeness of spelling (up to two letter changes), same sex, with a floor on all-time use. It catches Sophia/Sofia and Aiden/Ayden, and misses spellings that sound alike but look different, like Sean and Shawn.
Where Jillyn is used
Across 1910–2025, Jillyn was most concentrated in Utah — about 1 in 100,000 girls, against 1 in 181,500 across all states with data.
Most concentrated
- 1Utah1 in 100,000
Shading is the share of that state's recorded girls given this name, not the raw count — otherwise the map would just show which states are biggest. Unshaded states have no published records for this period. U.S. birth records suppress state-year counts below 5; state counts therefore don't add up to the national total. Every state links to its full rankings. Jillyn has too little recent state data to map, so this covers all years from 1910.
Jillyn by the numbers
The raw record for each sex the name is used for.
Names similar to Jillyn
Matched on shared beginnings and endings, similar length, and comparable popularity.
Sibling names for Jillyn
Names from the same era and popularity tier — the two things that make a sibling set feel deliberate — skipping lookalike spellings and shared initials.