Chelsea sits next to 4 phonetic neighbors — Kelsey, Chelsy, and Chelsie 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, chalk port"
"sunlight, warmth"
"place name: the Netherlands region"
"lord, master"
"fair one"
"son of the sea, great tide"
"beautiful rose"
"bright fame, shining fame"
"a day's travel (original etymology)"
"warrior woman (modern interpretation)"
"one who works the earth"
"enduring, from the mace clan"
"flowing, streaming"
"inheritance, something handed down through generations"
"helped by God"
"feminine of Michael (gift of God in folk etymology)"
"home ruler, estate ruler"
"exalted one, the high one"
"glowing ember, burning coal remnant"
"fairy queen, princess"
"divine messenger"
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.