Chelsea sits next to 3 phonetic neighbors — Chelsey, Kelsey, and Cheslea are the closest matches by sound. Most share Chelsea's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"chalk wharf, limestone landing"
"one who grants charters, document giver"
"strength, authority"
"My God is He"
"Of God; divinely seen"
"A standing position; one who holds their ground; a firm attitude"
"young attendant, page boy"
"resurrection, new beginning"
"serious, vigorous, resolute"
"winding stream, crooked well"
"bright valley"
"modern American coinage, unique creation"
"bearer of Christ"
Similar sound: These names share phonetic patterns with Chelsea — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old English origins, giving them the same cultural heritage as Chelsea.
Rhythm: Chelsea is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.