| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Kleon | - | Ancient Greek | ||
| Kleopatra | - | Ancient Greek | ||
| Kleopatros | - | Ancient Greek | ||
| Korinna | - | Ancient Greek | ||
| Kosmas | - | Ancient Greek | ||
| Kunibert | KOO-nee-bert (German) | German, Ancient Germanic | ||
| Kuno | KOO-no (German) | German, Ancient Germanic | ||
| Kyriakos | - | Greek, Ancient Greek | ||
| Kyrillos | - | Ancient Greek | ||
| Kyros | - | Ancient Greek, Biblical Greek | ||
| Lambert | LAHM-bert (German), LAHM-bərt (Dutch), lam-BER (French), LAM-bərt (English) | German, Dutch, French, English, Ancient Germanic | ||
| Lamprecht | LAHMP-rekht (German) | German (Archaic), Ancient Germanic | ||
| Landebert | - | Ancient Germanic | ||
| Lanzo | LAHN-tso (German) | German, Ancient Germanic | ||
| Leobwin | - | Ancient Germanic |