Darchelle sits next to 3 phonetic neighbors — Darnelle, Michelle, and Marchelle are the closest matches by sound. Most share Darchelle's Old French dar--origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"dear one, cherished"
"harvester; from the island of Thera"
"little one (diminutive suffix -ina)"
"happy, fortunate, blessed"
"valley"
"happy, fortunate"
"mighty counselor"
"Moon goddess; pledged to God"
"modern invented name"
"beloved, wished-for child"
Similar sound: These names share phonetic patterns with Darchelle — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old French dar- origins, giving them the same cultural heritage as Darchelle.
Rhythm: Darchelle is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.