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
"red king, famous ruler"
"hunter, one who hunts"
"God's gift"
"divine messenger"
"lion"
"born of fire"
"victory of the people (from Nicholas)"
"Yahweh is God"
"handsome at birth"
"farmer, earthworker"
"house builder, craftsman"
"from Grantham"
"story to be read, remarkable person"
"kingly, of royal blood"
"son of Kyle"
"son of the fair one"
"hay valley, hedged valley"
"from Attica, man of Athens"
"anointed one"
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.