Ada’s nice, a little unsubstantial as a first name but very cute as a nickname.
I don’t think it would be confused with
Ava if it was pronounced “A-da”. If it was pronounced “AY-da”, then it would definitely need constant correcting.
Adelaide Mary Jann flows nicer than
Adelaide Jann
Mary. Though,
Adelaide looks a bit strange next to much simpler Jann and
Mary.
Adelaide Claire Annette is beautiful.