| Keefe | - | Gaelic Name | Keegan | - | Gaelic Name |
| Keller | - | Gaelic Name | Kelly | - | Gaelic Name |
| Kelvin | - | Gaelic Name | Kendrick | - | Gaelic Name |
| Kennedy | - | Gaelic Name | Kenyon | - | Gaelic Name |
| Kermichael | - | Gaelic Name | Kermit | - | Gaelic Name |
| Kern | - | Gaelic Name | Kerr | - | Gaelic Name |
| Kerry | - | Gaelic Name | Kerwin | - | Gaelic Name |
| Kevin | - | Gaelic Name | Key | - | Gaelic Name |
| Kieran | - | Gaelic Name | Kinnard | - | Gaelic Name |
| Kinnell | - | Gaelic Name | Kyle | - | Gaelic Name |
| Kyna | - | Gaelic Name | Labhruinn | - | Gaelic Name |
| Lachlann | - | Gaelic Name | Laoidheach | - | Gaelic Name |
| Lawler | - | Gaelic Name | Leitis | - | Gaelic Name |
| Lennon | - | Gaelic Name | Lennox | - | Gaelic Name |
| Leslie | - | Gaelic Name | Liam | - | Gaelic Name |
| Lili | - | Gaelic Name | Liusaidh | - | Gaelic Name |
| Logan | - | Gaelic Name | Lon | - | Gaelic Name |
| Lucas | - | Gaelic Name | Luthais | - | Gaelic Name |
| Macabhaird | - | Gaelic Name | Macabhiadhtaiche | - | Gaelic Name |
| Macadhaimh | - | Gaelic Name | MacAlasdair | - | Gaelic Name |
| Mac-An-Aba | - | Gaelic Name | MacAnBhaillidh | - | Gaelic Name |
| MacAnBharain | - | Gaelic Name | MacAnBhreatannaich | - | Gaelic Name |
| MacAnTsaoir | - | Gaelic Name | MacAnTsagairt | - | Gaelic Name |
| MacArtuir | - | Gaelic Name | MacAsgaill | - | Gaelic Name |
| Mac Bheathain | - | Gaelic Name | MacBhriain | - | Gaelic Name |
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