Semantics of The Theonym
The semantics of the theonym are unknown. All the same, linguistic knowledge of Proto-Celtic lexis permits a narrowing of the likely possibilities of the theonym’s semantics. The name could be interpreted as an extended form of a stem composed of Proto-Celtic elements deriving from Proto-Indo-European roots *ad- ‘to’ + either *bʰend- ‘sing, rejoice’ or *bʰendʰ- ‘bind’. Along these lines, the name would mean ‘(the god) who sings to (something/someone)’ or ‘(the god) who binds (something/someone) to (something/someone).’ However, it is also possible to see the name as an extended form of a variant form of the Proto-Celtic word *abon- ‘river,’ derived from the Proto-Indo-European root *ab-, *h₂eb- ‘water, river’. The Romano-Celtic name for the Humber is documented as having been Abus which suggests that a shorter element *abo- existed in the Proto-Celtic lexicon as a word for ‘river’ or ‘water.’ This *abo- element could have been the source of the Ab-- element in the theonym Abandinus. So the name can also be analysed as *Ab-Andinus ‘Andinus of the River,’ Andinus being a theonym attested elsewhere in the ancient Roman Empire.
Read more about this topic: Abandinus