| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 481 | Liam | Gaelic | Helmeted. | M | |
| 482 | Liosliath | Gaelic | From the gray fortress. | M | |
| 483 | Logan | Gaelic | From the hollow. | M | |
| 484 | Loghan | Gaelic | From the hollow. | M | |
| 485 | Lon | Gaelic | Fierce. | M | |
| 486 | Lonn | Gaelic | Fierce. | M | |
| 487 | Lucas | Gaelic | Light. | M | |
| 488 | Luthais | Gaelic | Famous in battle. | M | |
| 489 | Mac | Gaelic | Son of. Scottish and Irish surname prefix sometimes used as a given name or nickname. Mack: (Scottish) Ancient Scottish given name. | M | |
| 490 | Mac a'bhaird | Gaelic | Son of Baird. | M | |
| 491 | Mac a'bhiadhtaiche | Gaelic | Son of Bhiadhtaiche. | M | |
| 492 | Mac Adhaimh | Gaelic | Son of Adam. | M | |
| 493 | Mac Ailean | Gaelic | Son of the handsome man. | M | |
| 494 | Mac Alasdair | Gaelic | Son of Alasdair. | M | |
| 495 | Mac an Aba | Gaelic | Son of the Father or Abbott. | M | |
| 496 | Mac an Bharain | Gaelic | Son of the noble warrior. | M | |
| 497 | Mac an Bhreatannai | Gaelic | Son of the Briton. | M | |
| 498 | Mac Artuir | Gaelic | Son of Arthur. | M | |
| 499 | Mac Asgaill | Gaelic | Son of Asgaill. | M | |
| 500 | Mac Bheathain | Gaelic | Son of the man who lives by the clear stream. | M | |