Tuyen sits next to 2 phonetic neighbors — Twen and Tuen are the closest matches by sound. Most share Tuyen's Vietnamese-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"Angel, fairy, heavenly being"
"God is gracious"
"lover of Gods glory"
"the Way, the natural path of the universe"
"chalk landing place"
"brightness, radiance"
"ascetic, one who renounces worldly pleasures"
"God is gracious (via Shawna/Sean)"
"God is gracious"
"invented name with graceful, flowing sound"
Similar sound: These names share phonetic patterns with Tuyen — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Vietnamese origins, giving them the same cultural heritage as Tuyen.
Rhythm: Tuyen is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.