Aidan sits next to 5 phonetic neighbors — Aiden, Ayden, and Aden are the closest matches by sound. Most share Aidan's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"battle worthy"
"fair-haired hero; white warrior"
"bowman, one who shoots arrows"
"gravelly homestead"
"light of heaven"
"Yahweh remembers"
"best"
"praised, thankful"
"precious and brave"
"God strengthens, Yahweh is my strength"
"divine healer"
"healer"
"son of David"
"defender of men"
"son of Andrew (manly)"
"holy person; one recognized for virtue and closeness to God"
"firebrand"
"from the bridges"
"sorrowful (folk etymology via French)"
"handsome"
Similar sound: These names share phonetic patterns with Aidan — similar vowel sounds, consonant clusters, or rhythm.
Rhythm: Aidan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.