Chelsey sits next to 3 phonetic neighbors — Chelsea, Kelsey, and Chelsie are the closest matches by sound. Most share Chelsey's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"chalk wharf on the Thames"
"of the lyre, musical one"
"Lord have mercy (prayer refrain)"
"industrious, hardworking"
"flowing, ease"
"Yahweh has shown favor"
"lily flower, purity"
"night conversation, to entertain"
"beam of light and divine messenger"
"lake; peaceful water"
"night life; beautiful night (from Arabic roots)"
"princess, noblewoman"
"exalted, sublime"
"mighty, powerful"
"cheerful, joyful"
"blessing, abundance"
"slender, graceful"
"lake (via Welsh llyn)"
"from the alder grove, descendant of the challenger"
"daughter of poverty (alternate etymology)"
"dark-complexioned"
Similar sound: These names share phonetic patterns with Chelsey — 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 Chelsey.
Rhythm: Chelsey is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.