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