Declan Nicknames:
- Dec
- Decco
- Deck
- Deco
- Deeks
- Dex
- Dee
- Lanny
- Lane
- D
Declan Variants:
- Deaglán (Irish)
- Declán (Irish)
- Declen (English)
- Deccan (English)
- Decklan (English)
- Deaclan (English)
- Deklan (English)
- Deklin (English)
- Declin (English)
- Deklynn (English)