Tallen sits next to 5 phonetic neighbors — Tallon, Talon, and Allen are the closest matches by sound. Most share Tallen's Welsh cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"high prominence, brow"
"promised land, merchant"
"beauty, handsomeness"
"meadow land, fallow land"
"ardor, enthusiasm (from Welsh Rhys)"
"court officer, legal summoner"
"landholder, lord"
"chief hero"
"fair warrior, fair hero"
"Bird-like, of or relating to birds"
"son of Rawlin, son of Ralph"
"law settlement, from Lexington"
"ruler of the army"
"modern American compound name"
"cold well; from the cold water source"
"Healer, one who cures"
"work power, vigor ruler"
"moonlit, bright moon"
"modern blend of group member names (Jo, DeVante, K-Ci)"
"rocky land, land of rock"
Similar sound: These names share phonetic patterns with Tallen — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Welsh/Celtic origins, giving them the same cultural heritage as Tallen.
Rhythm: Tallen is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.