boy's name
Castor
- Origin Latin
- Gender Boy
- Syllables 2
- Letters 6
- Popularity Uncommon
- Births on record 414
Castor is a boy's name with 2 syllables. In 2025 it was given to 21 babies in the United States. It is used consistently but remains uncommon.
- Castor is a name of Latin origin.
- Peaked in 2016, when 29 babies were given the name.
- It has been rising over the past decade.
- Today about 1 in 157,878 babies in the United States is given this name.
- First appears in US birth records in 1998.
- 2 syllables, with the stress on syllable 1.
Castor over time
Births per decade in the United States, 1990s 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 |
|---|---|
| 1990s | 19 |
| 2000s | 89 |
| 2010s | 176 |
| 2020s (to 2025) | 106 |
How popular is Castor?
In 2025, Castor was given to 21 babies in the United States. It is used consistently but remains uncommon.
Where Castor 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 Castor
These names rose and fell in the same era, which is why they tend to sound like they belong together.
Parents who like Castor also like
Names whose popularity has risen and fallen in step with Castor over the last century — the same taste, a different name.
Sibling names for Castor
Names from the same era that won't rhyme or share an initial with Castor — the two things that make a sibling set grate.
Common questions about Castor
How popular is the name Castor?
In 2025, Castor was given to 21 babies in the United States. It is used consistently but remains uncommon.
Is Castor a girl's or a boy's name?
Castor is given almost entirely to boys in birth records.
How many syllables are in Castor?
Castor has 2 syllables.
When was Castor most popular?
Castor peaked in 2016, when 29 babies were given the name. It has been rising over the past decade.
Is Castor a good name?
That is not something records can settle, but they can tell you what you would be choosing. Castor currently ranks #4,850 in the United States. It has been rising over the past decade. Everything else — how it sounds with your surname, who it reminds you of — is yours.