Teigan sits next to 3 phonetic neighbors — Tegan, Taegan, and Teagan are the closest matches by sound. Most share Teigan's Welsh cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"handsome, beautiful"
"courageous, valiant"
"fair-haired hero"
"from the southern lands"
"dwelling by the stream"
"light, bright one"
"dark, full; complete darkness"
"noble, renowned"
"possession, acquired"
"dark-haired chieftain"
"vigilant, watchful"
"little poet"
"rejoice; pure"
"son of Iain (John)"
"dove"
"invented name (no traditional meaning)"
"little dark one"
"little wolf"
"of the heights"
Similar sound: These names share phonetic patterns with Teigan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Welsh origins, giving them the same cultural heritage as Teigan.
Rhythm: Teigan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.