Onomastics is an important source of information on the early Celts, as Greco-Roman historiography recorded Celtic names before substantial written information becomes available in any Celtic language.
Like Germanic names, early Celtic names are often dithematic.
- suffix -rix "ruler"
- suffix -maris / -marus "great"
- Gwenhwyfar, from *Uindā Seibrā "White Phantom"
- Brigid, from *Brigantia "the High one"
- Lugh and Lleu, cognate with Gaulish Lugus
- Celtic toponymy
- Irish name
- Irish toponymy
- Germanic onomastics
- Scottish Gaelic personal naming system
- Scottish toponymy
- Welsh surnames
- Welsh toponymy