Where does “*kreddīmā” come from?

*kreddīmā (Proto-Celtic) comes from Proto-Celtic kreddīti, from Proto-Indo-European *ḱréddʰeh₁ti.

Ancestry of “*kreddīmā”, step by step

Step	Language	Word	Meaning
1	Proto-Celtic	kreddīti	to believe
2	Proto-Indo-European	*ḱréddʰeh₁ti	—

*kreddīmā — Etymology, Origin & Word History | Etymology Explorer