Celtic two-components place-names

To all the experts in Celtic languages:
do you know what are the first elements of these 2-elements place-names in
ancient Gallia, Hispania, Italia, Germania etc. ?

Acitodunum (Aqu.)
Ganodurum (Bel.)
Samarobriva (Bel.)
Arialdunum (Bet.)
Mirobriga (Bet., Lus., Tar.)
Meliodunum (Ger.)
Excingomagus (Ita.)
Darioritum (Lug.)
Va(r)goritum (Lug.)
Arabriga (Lus.)
Arcobriga (Lus., Tar.)
Tasgodunum (Nar.)
Gesodunum (Nor.)

Do you know some other problematic two-components Celtic place-names ?

Antonio