Chelsie sits next to 5 phonetic neighbors — Chelsea, Chelsey, and Kelsey are the closest matches by sound. Most share Chelsie's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"chalk wharf, landing place on the Thames"
"salt water, brine"
"olive tree"
"wide island"
"Work-power; industrious leader"
"children of deaf adults (modern acronym)"
"defender of mankind"
"ivory-white, creamy white"
Similar sound: These names share phonetic patterns with Chelsie — 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 Chelsie.
Rhythm: Chelsie is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.