Ocean sits next to 4 phonetic neighbors — Oceane, Oceania, and Marina are the closest matches by sound. Most share Ocean's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"the great sea, vast waters"
"captivating, snare"
"sunny place, sunshine"
"little Robert"
"estate of the fifth son"
"goddess of flowers and spring"
"lily flower, purity"
"pure, clean"
"dweller by the swamp"
"free woman"
"supplanter, one who follows"
"exalted one, the high one"
"God is my oath"
"freedom, the condition of being free"
"heavenly"
"elm grove"
"gift, grace"
"feminine of Michael (gift of God in folk etymology)"
"from the Isle of Skye"
"born on Christmas Day"
"land of the Malay people"
Similar sound: These names share phonetic patterns with Ocean — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek Okeanos origins, giving them the same cultural heritage as Ocean.
Rhythm: Ocean is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.