What does Cosmo mean?
Cosmo comes from the Greek kosmos, “order,” “harmony” or “universe.”
What does Perseus mean?
Perseus is the Greek hero who slew Medusa; his name is often linked to “to destroy.”
Cosmo vs Perseus
Which is more popular?
Perseus is more popular than Cosmo today: about 168 US babies were given the name Perseus in 2025, compared with 80 named Cosmo.
| Cosmo | Perseus | |
|---|---|---|
| Meaning | Order, universe | Of debated meaning |
| Origin | Greek | Greek |
| Gender | Boy | Boy |
| Pronunciation | KOZ-moh | PUR-see-us |
| Syllables | 2 | 3 |
| First appeared | 1910 | 1983 |
| Peak year | 2022 (99) | 2025 (168) |
| In 2025 | 80 | 168 |
| Trend | Rising | Near its peak |
Popularity over time, 1880–2025
Cosmo
Perseus
Source: US Social Security Administration.
Births by decade
| Decade | Cosmo | Perseus |
|---|---|---|
| 2020s | 510 | 813 |
| 2010s | 282 | 561 |
| 2000s | 254 | 5 |
| 1990s | 172 | 0 |
| 1980s | 108 | 11 |
| 1970s | 128 | 0 |
| 1960s | 121 | 0 |
| 1950s | 191 | 0 |
| 1940s | 191 | 0 |
| 1930s | 286 | 0 |
| 1920s | 452 | 0 |
| 1910s | 254 | 0 |
Frequently asked questions
Is Cosmo or Perseus more popular?
Perseus is more popular than Cosmo today: about 168 US babies were given the name Perseus in 2025, compared with 80 named Cosmo.
What is the difference between Cosmo and Perseus?
Cosmo means Order, universe (Greek origin), while Perseus means Of debated meaning (Greek origin).
Which name is older, Cosmo or Perseus?
In US records, Cosmo first appears in 1910 and Perseus in 1983, so Cosmo has the longer recorded history.