Zeth sits next to 3 phonetic neighbors — Seth, Zeb, and Zed are the closest matches by sound. Most share Zeth's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"appointed, placed"
"land of the Bretons, from Brittany France"
"narrow river"
"friend, companion (South Asian usage)"
"noble kind, of noble birth"
"one who pulls; stubborn"
"place at the bridge on the Bann"
"of the domain, lord's estate"
"mountain"
"settlement by the valley"
"invented American name with -elvin family phonetic pattern"
"fate, destined path, divine purpose"
"Settlement by the rocks"
Similar sound: These names share phonetic patterns with Zeth — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew origins, giving them the same cultural heritage as Zeth.
Rhythm: Zeth is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.