Tegan sits next to 3 phonetic neighbors — Teagan, Regan, and Keegan are the closest matches by sound. Most share Tegan's Welsh cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"darling, treasured one"
"ridge of rock or coral beneath the sea"
"supplanter, one who follows at the heel"
"Dack's settlement"
"increasing, growing, abundance"
"gray valley, son of the gray one"
"possible Japanese aesthetic: figure, image"
"son of William"
"of the trees"
"son of William"
"companion, ally"
"God has healed"
"battle-ready, martial spirit"
"God given, divine gift"
"crow crossing"
"worthy, powerful"
"wave"
"new year, fresh beginning"
"diminutive of Judith, praised woman"
"God is gracious"
"western meadow, western clearing"
Similar sound: These names share phonetic patterns with Tegan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Welsh origins, giving them the same cultural heritage as Tegan.
Rhythm: Tegan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.