Ethic sits next to 4 phonetic neighbors — Ethan, Eric, and Ethnic are the closest matches by sound. Most share Ethic's Greek-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"moral principles, code of conduct"
"hammer, mallet"
"nickname name (Thai given name)"
"God"
"the solar deity"
"free man"
"elevated, lofty"
"serious, vigorous, resolute"
"son of Jack, God is gracious"
"river crossing dweller"
Similar sound: These names share phonetic patterns with Ethic — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Ethic.
Rhythm: Ethic is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.