Delancey sits next to 3 phonetic neighbors — Delancey, Lancelot, and Delaney are the closest matches by sound. Most share Delancey's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"from Lancy, from the lancet-shaped place"
"from Darney (place name)"
"battle warrior, powerful ruler"
"ash tree settlement (variant of Ashton)"
"of the Flavian family"
"dove (the bird)"
"one who crosses; toll collector at a crossing"
"little rose"
"line of rulers, powerful family succession"
"spear"
"beloved, gracious (variant of Erasmus)"
"rallying banner"
"bright meadow, shire clearing"
Similar sound: These names share phonetic patterns with Delancey — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have French origins, giving them the same cultural heritage as Delancey.
Rhythm: Delancey is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.