Mercy sits next to 3 phonetic neighbors — Percy, Mersey, and Marcy are the closest matches by sound. Most share Mercy's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"compassion, forgiveness, clemency"
"one of good character"
"possibly derived from Jason (healer) via phonetic alteration"
"page boy (de Chiel)"
"from the third settlement"
"manly, brave, strong (via Andre/Andreas)"
"blazing torch, flaming sword"
"manly, masculine (as variant of Drew/Andrew)"
"creative respelling of Zion (highest point, monument)"
"chief, leader"
"God has given me a precious gift"
"term of endearment for the firstborn or youngest son"
"son of Aphrodite, Sicilian king"
"one who rides, horse rider"
"wise counsel and army"
"watchman, alert"
"the precious metal silver"
"sea/pure/rejoice (Kai) + son of (-sen)"
"one who bakes (occupational surname)"
"sky (variant of Kai)"
"strong, powerful"
Similar sound: These names share phonetic patterns with Mercy — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin via Old French origins, giving them the same cultural heritage as Mercy.
Rhythm: Mercy is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.