boy's name
Brennan
- Origin Irish
- Gender Boy
- Syllables 2
- Letters 7
- Popularity Uncommon
- Births on record 38,898
Scotland
#830
2022 births
Brennan is a boy's name with 2 syllables. In 2025 it was given to 236 babies in the United States. It is used consistently but remains uncommon.
- Brennan is a name of Irish origin.
- Peaked in 2009, when 1,550 babies were given the name.
- It has been falling over the past decade.
- Today about 1 in 14,048 babies in the United States is given this name.
- First appears in US birth records in 1916.
- 2 syllables, with the stress on syllable 1.
Brennan over time
Births per decade in the United States, 1910s to 2020s. The striped bar is the 2020s, still in progress — it covers 2020 to 2025, not a full ten years.
Show the numbers
| Decade | Births |
|---|---|
| 1910s | 5 |
| 1940s | 6 |
| 1950s | 80 |
| 1960s | 394 |
| 1970s | 1,008 |
| 1980s | 2,973 |
| 1990s | 8,874 |
| 2000s | 12,394 |
| 2010s | 8,170 |
| 2020s (to 2025) | 1,583 |
How popular is Brennan?
In 2025, Brennan was given to 236 babies in the United States. It is used consistently but remains uncommon.
Where Brennan is used
US figures omit any name given to fewer than five babies in a year, so the rarest names are absent from the source rather than absent from use. Data & sources.
Names that peaked alongside Brennan
These names rose and fell in the same era, which is why they tend to sound like they belong together.
Parents who like Brennan also like
Names whose popularity has risen and fallen in step with Brennan over the last century — the same taste, a different name.
Sibling names for Brennan
Names from the same era that won't rhyme or share an initial with Brennan — the two things that make a sibling set grate.
Common questions about Brennan
How popular is the name Brennan?
In 2025, Brennan was given to 236 babies in the United States. It is used consistently but remains uncommon.
Is Brennan a girl's or a boy's name?
Brennan is given almost entirely to boys in birth records.
How many syllables are in Brennan?
Brennan has 2 syllables.
When was Brennan most popular?
Brennan peaked in 2009, when 1,550 babies were given the name. It has been falling over the past decade.
Is Brennan a good name?
That is not something records can settle, but they can tell you what you would be choosing. Brennan currently ranks #1,004 in the United States. It has been falling over the past decade. Everything else — how it sounds with your surname, who it reminds you of — is yours.