Reagan sits next to 4 phonetic neighbors — Regan, Raegan, and Megan 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
"little ruler, impulsive one"
"keeper of the park or game"
"grace, favor"
"aspen tree"
"descendant of Leannán"
"person from Scotland"
"fair, lovely"
"strong, full-grown"
"smiley, cheerful (derived from nickname)"
"friend, companion"
"ruler of the household"
"harvest time"
"pale, fair"
"born at dawn"
"bright, luminous"
"noble one"
"grace, favor of God"
"the Frenchman, one who is free"
"divine play"
"immortal (folk etymology)"
"Pacca's town"
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.