Sebastyn
Boys' nameMeaning not yet documented
Sebastyn has been given to 31 babies in the U.S. since 2009. 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 2011, with 9 recorded.
Babies named Sebastyn, 2017
1 in 596,000
Sebastyn 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 Gaps mean the name was given fewer than 5 times that year; these counts are unpublished.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 Sebastyn?
Sebastyn had fewer than 5 recorded uses in 2025, so these figures use 2017, the last year it was published.
- Among all babies, 2017
- 1 in 596,000
- 6 of 3,577,106 births
- Among boys only
- 1 in 308,000
- <0.01% of boys
- Rank, 2017
- Unranked
- Fewer than 5 uses
- Coin-flip room size
- 413,245 kids
- Even odds of a second one
Where Sebastyn sits on the popularity scale
Chance at least one other child shares the name
If the other children were drawn at random from the 2017 national name distribution. Real classrooms cluster by region and community, so treat these as a floor, not a ceiling.
Put another way: gather 413,245 children born in 2017 and it's an even bet that one of them is another Sebastyn. In a class of 30 the chance is Under 1%.
When Sebastyns were born
Half of everyone ever recorded as Sebastyn was born before 2013 — so the typical Sebastyn is around 12 today.
- Biggest decade
- 2010s
- 80.6% of all use
- Born in the last 25 years
- 100.0%
- A modern name
- Recorded since 1950
- 31
- People you could plausibly meet
2010s — 80.6% of all recorded uses (25).
Is Sebastyn 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 2011 (9)
- Years since peak
- 14
- Years
- Year-to-year steadiness
- Not enough data
- Too few years
Spellings of Sebastyn
Sebastyn is not the most common spelling — Sebastian is, with 97.0% against Sebastyn's 0.01%.
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.
Sebastyn around the world
Where Sebastyn 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 Australia2009–2009#708in 2009
Popularity data from Consumer and Business Services (South Australia). CBS SA data under CC BY 4.0.
Sebastyn by the numbers
The raw record for each sex the name is used for.
Names similar to Sebastyn
Matched on shared beginnings and endings, similar length, and comparable popularity.
Sibling names for Sebastyn
Names from the same era and popularity tier — the two things that make a sibling set feel deliberate — skipping lookalike spellings and shared initials.