Sedna sits next to 4 phonetic neighbors — Selena, Sabrina, and Serena are the closest matches by sound. Most share Sedna's Inuit mythology-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"Inuit goddess of the sea; ruler of the deep"
"modern nickname-name (from Bacardi)"
"modern coinage; creative invention"
"ascent, going up"
"beloved"
"heavenly (from Hawaiian -ani suffix)"
"God's love"
"coined name with no established meaning"
"star (folk etymology from Latin aster)"
"inspiring wonder and awe"
Similar sound: These names share phonetic patterns with Sedna — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Inuit mythology origins, giving them the same cultural heritage as Sedna.
Rhythm: Sedna is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.