Ocean sits next to 4 phonetic neighbors — Oceane, Austin, and Tristan 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
"great surrounding sea"
"noble friend, elf friend"
"gift of God, blessed one"
"son of marsh-dwellers"
"abundant, bountiful"
"dexterous, adept"
"alert, watchful, vigilant"
"Yahweh has strengthened"
"son of James"
"may God protect"
"thunder and lightning"
"home ruler"
"deliverance of God"
"God is gracious (via John/Zane)"
"my God is Yahweh"
"son of Otto"
"arrow maker"
"enthusiasm, ardent"
"dark man's settlement, coal-black farm"
"mill worker, grain grinder"
"servant, messenger"
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.