Teagan sits next to 4 phonetic neighbors — Reagan, Keegan, and Logan are the closest matches by sound. Most share Teagan's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"little poet, little philosopher"
"famous through noble birth"
"powerful in battle"
"to listen, to spy out"
"descendant of Ceallach"
"built by the Lord"
"land of the Bronck family"
"youth, young warrior"
"quiet, calm, reserved"
"watchful, vigilant"
"land power, territorial lord"
"qualitative time, the fullness of time"
"Jehovah is God"
"dweller in the valley"
"bent grass clearing, meadow"
"sea land"
"of God, heavenly"
"God is gracious (if related to John)"
"a large inland body of water"
"he who resembles God (rhetorical)"
"son of Gilbert, son of Gib"
Similar sound: These names share phonetic patterns with Teagan — 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 Teagan.
Rhythm: Teagan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.