Reagan sits next to 4 phonetic neighbors — Regan, Keegan, and Brogan are the closest matches by sound. Most share Reagan's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"impulsive, little king"
"swift projectile, arrow"
"little dark one"
"supreme ruler"
"fair-haired, blonde head"
"land power, territorial lord"
"God has exalted (Jah + kai)"
"little fire; battle-worthy"
"little bear, bear cub"
"castle, fortress, palace"
"new house, bright"
"holy river"
"people's power"
"watchful, vigilant"
"powerful ruler"
"rye land; land where rye grows"
"huckleberry berry plant"
"from Clare (Suffolk)"
"descendant of Cinneide"
"little rock"
"follower of Dionysus, god of wine"
Similar sound: These names share phonetic patterns with Reagan — 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 Reagan.
Rhythm: Reagan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.