What does Cosmo mean?
Cosmo comes from the Greek kosmos, “order,” “harmony” or “universe.”
What does Lysander mean?
Lysander means “liberator” or “releaser of men” in Greek.
Cosmo vs Lysander
Which is more popular?
Lysander is more popular than Cosmo today: about 95 US babies were given the name Lysander in 2025, compared with 80 named Cosmo.
| Cosmo | Lysander | |
|---|---|---|
| Meaning | Order, universe | Liberator |
| Origin | Greek | Greek |
| Gender | Boy | Boy |
| Pronunciation | KOZ-moh | ly-SAN-der |
| Syllables | 2 | 3 |
| First appeared | 1910 | 1931 |
| Peak year | 2022 (99) | 2025 (95) |
| In 2025 | 80 | 95 |
| Trend | Rising | Near its peak |
Popularity over time, 1880–2025
Cosmo
Lysander
Source: US Social Security Administration.
Births by decade
| Decade | Cosmo | Lysander |
|---|---|---|
| 2020s | 510 | 256 |
| 2010s | 282 | 301 |
| 2000s | 254 | 151 |
| 1990s | 172 | 5 |
| 1980s | 108 | 21 |
| 1970s | 128 | 38 |
| 1960s | 121 | 15 |
| 1950s | 191 | 6 |
| 1940s | 191 | 0 |
| 1930s | 286 | 5 |
| 1920s | 452 | 0 |
| 1910s | 254 | 0 |
Frequently asked questions
Is Cosmo or Lysander more popular?
Lysander is more popular than Cosmo today: about 95 US babies were given the name Lysander in 2025, compared with 80 named Cosmo.
What is the difference between Cosmo and Lysander?
Cosmo means Order, universe (Greek origin), while Lysander means Liberator (Greek origin).
Which name is older, Cosmo or Lysander?
In US records, Cosmo first appears in 1910 and Lysander in 1931, so Cosmo has the longer recorded history.