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"
"one who pulls; stubborn"
"mountain"
"Settlement by the rocks"
"one who lives near a bend; from the bend"
"settlement by the valley"
"from the River Bandon, white water"
"land of the Bretons, from Brittany France"
"noble kind, of noble birth"
"tomorrow"
"from the river Kelvin"
"invented American name with -elvin family phonetic pattern"
"fate, destined path, divine purpose"
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.