Where does “-და-” come from?

-და- (Georgian) comes from Georgian და, from Old Georgian დაჲ, from Proto-Kartvelian da- — sister.

Ancestry of “-და-”, step by step

Step	Language	Word	Meaning
1	Georgian	და	sister; and
2	Old Georgian	დაჲ	sister
3	Proto-Kartvelian	da-	sister

Words derived from “-და-”

Every word from Proto-Kartvelian da- →Every word from Old Georgian დაჲ →Every word from Georgian და →