| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 401 | Ohanko | NativeAmerican | Reckless. | M | |
| 402 | Ohanzee | NativeAmerican | Shadow (Sioux). | M | |
| 403 | Ohcumgache | NativeAmerican | Little wolf (Cheyenne). | M | |
| 404 | Ohitekah | NativeAmerican | Brave (Sioux). | M | |
| 405 | Okhmhaka | NativeAmerican | Little wolf (Cheyenne). | M | |
| 406 | Olathe | NativeAmerican | Beautiful. | F | |
| 407 | Omawnakw | NativeAmerican | Cloud feather (Hopi). | M | |
| 408 | Ominotago | NativeAmerican | Beautiful voice (Chippewa). | F | |
| 409 | Onawa | NativeAmerican | Wide awake. | F | |
| 410 | Onida | NativeAmerican | The one searched for. | F | |
| 411 | Oota dabun | NativeAmerican | Day star (Algonquin). | F | |
| 412 | Otaktay | NativeAmerican | Kills many (Sioux). | M | |
| 413 | Otoahhastis | NativeAmerican | Tall bull (Cheyenne). | M | |
| 414 | Otoahnacto | NativeAmerican | Bull bear (Cheyenne). | M | |
| 415 | Ouray | NativeAmerican | Arrow. | M | |
| 416 | Pachu'a | NativeAmerican | Feathered water snake (Hopi). | M | |
| 417 | Paco | NativeAmerican | Eagle. | M | |
| 418 | Pahana | NativeAmerican | Lost white brother (Hopi). | M | |
| 419 | Pakwa | NativeAmerican | Frog (Hopi). | F | |
| 420 | Pallaton | NativeAmerican | Warrior. | M | |