Zenith sits next to 4 phonetic neighbors — Xena, Zena, and Zenobia are the closest matches by sound. Most share Zenith's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"the highest point in the sky"
"one who lives near a lake; water dweller"
"resolute protector, war-high"
"one who understands, expert"
"abundance, growth"
"ethereal, of God"
"flowing water, narrow stream"
"God is my light, flame of God"
"willow tree"
"little red-haired one (via Russ root)"
"God is my judge"
"strong, virtuous, honorable"
"other Aenor, foreign one"
"defender of men (if from Alex root)"
"of the Jenkin family"
"strong, vigorous"
"fleet of ships, navy blue"
"poem with repeated refrain"
"Diana (goddess of the hunt)"
"princess, beautiful"
Similar sound: These names share phonetic patterns with Zenith — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Arabic origins, giving them the same cultural heritage as Zenith.
Rhythm: Zenith is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.