| Cosmo | Isidore | |
|---|---|---|
| Meaning | Order, universe | gift of Isis |
| Origin | Greek | greek |
| Gender | Boy | Boy |
| Pronunciation | KOZ-moh | IZ-i-dor |
| Syllables | 2 | 3 |
| First appeared | 1910 | 0 |
| Peak year | 2022 (99) | 1919 (183) |
| In 2025 | 80 | 0 |
| Trend | Rising | Vintage |
Source: US Social Security Administration.
| Decade | Cosmo | Isidore |
|---|---|---|
| 2020s | 510 | 156 |
| 2010s | 282 | 130 |
| 2000s | 254 | 64 |
| 1990s | 172 | 30 |
| 1980s | 108 | 20 |
| 1970s | 128 | 31 |
| 1960s | 121 | 98 |
| 1950s | 191 | 135 |
| 1940s | 191 | 101 |
| 1930s | 286 | 180 |
| 1920s | 452 | 849 |
| 1910s | 254 | 1,357 |
| 1900s | 0 | 159 |
| 1890s | 0 | 72 |
| 1880s | 0 | 39 |
Cosmo comes from the Greek kosmos, “order,” “harmony” or “universe.”
From Greek Isidoros, combining the goddess name Isis + doron 'gift' — 'gift of Isis'. The 'gift' element (doron) is the same one found in Theodore and Dorothea; here the giver is the Egyptian goddess rather than God.
Cosmo is more popular than Isidore today: about 80 US babies were given the name Cosmo in 2025, compared with 0 named Isidore.
Cosmo means Order, universe (Greek origin), while Isidore means gift of Isis (greek origin).
In US records, Cosmo first appears in 1910 and Isidore in 0, so Isidore has the longer recorded history.