| Cosmo | Sirius | |
|---|---|---|
| Meaning | Order, universe | Named for the Dog Star |
| Origin | Greek | greek |
| Gender | Boy | Boy |
| Pronunciation | KOZ-moh | SEER-ee-us |
| Syllables | 2 | 3 |
| First appeared | 1910 | 0 |
| Peak year | 2022 (99) | 2022 (61) |
| In 2025 | 80 | 0 |
| Trend | Rising | Rising |
Source: US Social Security Administration.
| Decade | Cosmo | Sirius |
|---|---|---|
| 2020s | 510 | 279 |
| 2010s | 282 | 319 |
| 2000s | 254 | 117 |
| 1990s | 172 | 9 |
| 1980s | 108 | 0 |
| 1970s | 128 | 0 |
| 1960s | 121 | 0 |
| 1950s | 191 | 0 |
| 1940s | 191 | 0 |
| 1930s | 286 | 0 |
| 1920s | 452 | 0 |
| 1910s | 254 | 0 |
Cosmo comes from the Greek kosmos, “order,” “harmony” or “universe.”
The proper name of the brightest star in the night sky, from Greek 'Seirios' meaning 'scorching' or 'glowing'. Unlike most star names it is Greek rather than Arabic, and the literal sense is 'scorching/glowing' rather than 'star'.
Cosmo is more popular than Sirius today: about 80 US babies were given the name Cosmo in 2025, compared with 0 named Sirius.
Cosmo means Order, universe (Greek origin), while Sirius means Named for the Dog Star (greek origin).
In US records, Cosmo first appears in 1910 and Sirius in 0, so Sirius has the longer recorded history.