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"
"bird-like, relating to birds"
"dark, black"
"honey bee"
"my princess"
"lovely, fair"
"meadow near the birch trees"
"feminine of Michael (gift of God in folk etymology)"
"noble elf ruler"
"meadow of the wren"
"little Laura"
"slender, graceful"
"gift from God"
"feminine form of Michael"
"descendant of Fionnlaoich (fair hero)"
"luminous glow, energy field"
"summer"
"grace, favor"
"sweet substance, beloved, precious"
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.