| Name | Meaning | Gender | Origin |
|---|
| Kiara | Clear | Female | Latin |
| Kiera | Dark | Female | Gaelic |
| Kieran | Little dark one | Male | Gaelic |
| Kierra | Dark | Female | Gaelic |
| Killian | War | Male | Gaelic |
| Kira | Dark | Female | Gaelic |
| Kirby | Church settlement | Female | Norse |
| Kody | Descendant of Cuidighthigh | Male | Gaelic |
| Kona | World rule | Unisex | Gaelic |
| Konnor | Lover of hounds | Male | Gaelic |
| Korbin | A steep hill | Male | Gaelic |
| Kyla | Church | Female | Gaelic |
| Kyle | Church | Male | Gaelic |
| Kyran | Little dark one | Male | Gaelic |
| Lachlan | Warrior from the Land of the Lochs | Unisex | Gaelic |
| Lana | Rock | Female | Gaelic |
| Laoghaire | Keeper of calves | Male | Gaelic |
| Lee | Clearing, meadow | Female | English |
| Leith | A harbour in Scotland | Male | Gaelic |
| Lennon | Descendant of Leannán or Lonán | Male | Gaelic |
| Lennox | From Levenach | Male | Gaelic |
| Les | Holly Garden | Male | Gaelic |
| Lesley | Holly Garden | Female | Gaelic |
| Leslie | Holly Garden | Female | Gaelic |
| Lesly | Holly Garden | Female | Gaelic |
| Lia | Uncertain, possibly from Rosalia | Female | Italian |
| Liadan | Grey Lady | Female | Irish |
| Liam | Will, desire and helmet, protection | Male | Germanic |
| Lil | Lily | Unisex | English |
| Lindsay | Uncertain, perhaps dark lake | Female | Gaelic |