Darcy sits next to 4 phonetic neighbors — Percy, Marcy, and Ciarán are the closest matches by sound. Most share Darcy's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"from Arcy (place name)"
"valley of the River Kent"
"son of Dennis"
"little joy"
"hunter"
"first of the month, calends"
"calm, serene, protective"
"peace settlement"
"industrious ruler"
"related to Everett (brave boar)"
"split, torn apart"
"modern variant of Milan/Milen"
"elevated, sublime, lofty"
"son of David, son of the beloved"
"stone ringfort, castle"
"ruler of the spear"
"noble's settlement"
"absence of conflict, wholeness"
"sea god, messenger of the deep"
"olive tree man"
Similar sound: These names share phonetic patterns with Darcy — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old French origins, giving them the same cultural heritage as Darcy.
Rhythm: Darcy is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.