Deegan sits next to 4 phonetic neighbors — Keegan, Reagan, and Teagan are the closest matches by sound. Most share Deegan's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"descendant of the black-haired one"
"raven, crow"
"brown, chief"
"pledge, oath"
"goddess of the hunt and moon"
"narrow strait"
"beloved youngest son"
"of the Sabine people"
"reputation, esteem"
"cloud"
"modern American invented name"
"speed, power (modern association)"
"descendant of the fair one"
"rich friend"
"from Radley (red clearing)"
"descendant of the courageous one"
"bear"
"peaceful ruler"
"craftsman who works with metal"
"brave spear, strong with a spear"
"bright, splendid"
Similar sound: These names share phonetic patterns with Deegan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Irish Gaelic origins, giving them the same cultural heritage as Deegan.
Rhythm: Deegan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.