Regan sits next to 4 phonetic neighbors — Reagan, Megan, and Keegan are the closest matches by sound. Most share Regan's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"little king, royal one"
"Great land, the mainland"
"eternal flower, forever flowering"
"warrior, strong woman"
"helper, assistant"
"meadow near the church"
"dream, vision (possible Aislinn influence)"
"weary, delicate"
"strength of God"
"divine sky child"
"life, living"
"ship's victory"
"worshipful devotion"
"queen, powerful ruler"
"dear little Ana, gracious one"
"going up, elevation"
"beautiful, lovely"
"one of high honor"
"sea and sky (poetic)"
"modern coined name"
"fair, pale, bright"
Similar sound: These names share phonetic patterns with Regan — 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 Regan.
Rhythm: Regan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.