Illia

Girls' name

Transliteration of Ілля́

Illia has been given to 17 babies in the U.S. since 1980. 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 2021, with 6 recorded.

Babies named Illia, 2023

1 in 552,000

Illia over time, 1880–2025

Girls

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 Gaps mean the name was given fewer than 5 times that year; these counts are unpublished.

Illia: meaning, origin, and history

Transliteration of Ілля́

Deeper origin not confirmed in the cited records

What Illia means

Illia is a transliteration of Ілля́.

Origin, language, and formation

Illia is used in English.

Illia comes through Ukrainian Ілля́.

Related names and everyday forms

Related names include Ілля́ and Илья́.

American usage and historical context

In the United States, 17 girls were recorded with the name Illia between 1980 and 2023. Its highest annual count was 6 in 2021; its best national rank was #10,955 in 1980.

Sources & methodologyReferences, data & attribution

Meaning, origin, and language notes draw on the references below.

American popularity figures use published Social Security Administration records for this exact spelling. Counts below five for a name, sex, and year are omitted.

Wiktionary material is available under CC BY-SA 4.0.

How common is Illia?

Illia had fewer than 5 recorded uses in 2025, so these figures use 2023, the last year it was published.

Among all babies, 2023: 1 in 552,000; 6 of 3,314,783 births
Among girls only: 1 in 267,000; <0.01% of girls
Rank, 2023: Unranked; Fewer than 5 uses
Coin-flip room size: 382,940 kids; Even odds of a second one

Where Illia sits on the popularity scale

Rarest published (5 a year)#1 — Olivia (13,544)

Chance at least one other child shares the name

If the other children were drawn at random from the 2023 national name distribution. Real classrooms cluster by region and community, so treat these as a floor, not a ceiling.

Class of 20Under 1%

Class of 30Under 1%

Grade of 100Under 1%

School of 500Under 1%

Put another way: gather 382,940 children born in 2023 and it's an even bet that one of them is another Illia. In a class of 30 the chance is Under 1%.

When Illias were born

Half of everyone ever recorded as Illia was born before 2021 — so the typical Illia is around 4 today.

Median birth year: 2021; About 4 years old
Biggest decade: 2020s; 70.6% of all use
Born in the last 25 years: 70.6%; A modern name
Recorded since 1950: 17; People you could plausibly meet

Choose a decade

2020s — 70.6% of all recorded uses (12).

Is Illia 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 2021 (6)
Years since peak: 4; Years
Year-to-year steadiness: Not enough data; Too few years
Best rank ever: #10,955; 1980

Spellings of Illia

Illia is not the most common spelling — Julia is, with 17.8% against Illia's <0.01%.

Julia17.8%476,250
Lillian17.8%475,028
Ella13.1%351,313
Lillie5.9%158,918
Willie5.5%146,197
Ellie3.9%105,677
Billie3.9%103,663
Jillian3.1%83,197

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.

Illia around the world

Where Illia ranks in official birth records elsewhere in the world. Rankings only — the number of births isn’t comparable between places, so it isn’t shown.

South Australia
1971–2006
#657
in 2006

Popularity data from Consumer and Business Services (South Australia). CBS SA data under CC BY 4.0.

Illia by the numbers

The raw record for each sex the name is used for.

As a girl's name

Rank in 2025: Unranked
Trend vs 5 yrs ago: —
Best rank ever: #10,955; 1980
Peak year: 2021; 6 that year
First recorded: 1980
Last recorded: 2023
All-time count: 17
Count in 2025: Under 5

Names similar to Illia

Matched on shared beginnings and endings, similar length, and comparable popularity.

Illy Illah Illari Sulia Illya Tullia Kaelia Pelia Yalia Illumi Avelia Xaelia Ollia Silia Acelia Vilia Jelia Leilia Sylia Cylia Kulia Aralia Valia Maelia

Sibling names for Illia

Names from the same era and popularity tier — the two things that make a sibling set feel deliberate — skipping lookalike spellings and shared initials.

For a sister

Journi Lennox Berkley Layne Ellison Legacy Marleigh Adley

For a brother

Henri Rian Finnley Axton Yaakov Grey Magnus Ameer

Explore around Illia

Top names of 2021, Illia's peak year The 2020s in full Other names that peaked in 1980 Girls' names starting with I