Mert sits next to 3 phonetic neighbors — Bert, Curt, and Merce are the closest matches by sound. Most share Mert's Turkish-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"manly, courageous"
"spiritual enlightened one"
"goodness of the faith"
"true believer, one who inclines toward truth"
"prophet swallowed by whale"
"of the faith, religion"
"speaker, eloquent"
"one who brings life and growth"
"freshness, water"
"God's inspiration"
"to listen, to permit"
"firm, strong, steadfast"
Similar sound: These names share phonetic patterns with Mert — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Turkish origins, giving them the same cultural heritage as Mert.
Rhythm: Mert is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.