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"
"ancestor's descendant"
"rocky hill, tower"
"beautiful"
"light, bright"
"lily, rose"
"land of the Scots"
"exalted, high, strength"
"foreign riches, wealth from afar"
"wish, desire"
"clarity, clearness"
"little rock, harmony"
"Hospitable, guest-friend"
"one of the Goths, a Goth's descendant"
"combination of Mary and Lena"
"Lake, waterfall"
"little pearl"
"God is gracious"
"grace and devotion to God (Anna + Elisa)"
"heart, mind, spirit"
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.