| Kieran˜ | - | Irish Name | Killian | - | Irish Name |
| Kim | - | Vietnamese Name | Kinnard | - | Irish Name |
| Kinsey˜ | - | English Name | Kiran | - | Sanskrit Name |
| Kito | - | Swahili Name | Kolya | - | Russian Name |
| Kyne | - | English Name | Lachlan | - | Scottish Name |
| Lafayette | - | French Name | Laine | - | English Name |
| Lal | - | Sanskrit Name | Lamar | - | Teutonic Name |
| Lamech | - | Hebrew Name | Lamont | - | French Name |
| Lani | - | Polynesian Name | Lann | - | Celtic Name |
| Lars | - | Latin Name | Leal | - | Teutonic Name |
| Leif | - | Norse Name | Lennon | - | Irish Name |
| Lennox | - | Scottish Name | Levi | - | Hebrew Name |
| Levin | - | Russian Name | Linton | - | English Name |
| Lorant | - | Hungarian Name | Lorenzo | - | Spanish Name |
| Lorne | - | Scottish Name | Lucian | - | Latin Name |
| Madoc | - | Welsh Name | Mahir | - | Hebrew Name |
| Mahon | - | Irish Name | Makis | - | Greek Name |
| Maksim | - | Latin Name | Malachi | - | Hebrew Name |
| Malik | - | Arabic Name | Malin | - | English Name |
| Malise | - | Scottish Name | Manaia | - | Maori Name |
| Manas | - | Scottish Name | Mani | - | Sanskrit Name |
| Manu | - | Polynesian Name |
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