| Karl | | KAHRL (German, Danish, English, Finnish) | German, Swedish, Norwegian, Danish, English, Finnish, Ancient Germanic | |
| Kunibert | | KOO-nee-bert (German) | German, Ancient Germanic | |
| Kuno | | KOO-no (German) | German, Ancient Germanic | |
| 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 | |
| Leonard | | LEN-ərd (English), LAY-o-nahrt (Dutch) | English, Dutch, German, Ancient Germanic | |
| Leudagar | | - | Ancient Germanic | |
| Leudbald | | - | Ancient Germanic | |
| Leudoberct | | - | Ancient Germanic | |
| Leutgard | | - | Ancient Germanic | |
| Leuthar | | - | Ancient Germanic | |
| Leutwin | | - | Ancient Germanic | |