My first thought was to search for it in a list of Germanic name elements.
The only acceptable one seems to be *Daga- (also written as Daghi-, Dagi-, Daci-, Taghi-, Tachi-, Tagi-, Taci-, Tachin-,
Dai-, Tahi-,
Dag-, Tac-,
Da-).
It means "day". A name with this element is, for example, Dagobert.
It would be amazing if you could give us more information about this name. Where did you find it? What language do it belong to?