Tristen sits next to 3 phonetic neighbors — Tristan, Tristin, and Kristin are the closest matches by sound. Most share Tristen's Welsh cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"tumult, noise"
"held by the heel (biblical reference)"
"cypress tree"
"son of Anne, son of Agnes"
"from the western direction"
"wealthy, kingly, upholder of good"
"to conquer, to win"
"Christian cross, symbol of faith"
"may God protect"
"dove, peaceful one"
"land power, territorial lord"
"from Clare (Suffolk)"
"dark, swarthy"
"of God, heavenly"
"lake dweller, from the lake"
"modern invented name, possibly dark one"
"strong like a boar"
"selected, chosen one"
"son of Harry, home ruler"
"serpent's mouth"
"cross, crossroads"
Similar sound: These names share phonetic patterns with Tristen — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Celtic/Pictish origins, giving them the same cultural heritage as Tristen.
Rhythm: Tristen is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.