Coy sits next to 3 phonetic neighbors — Roy, Troy, and Joy are the closest matches by sound. Most share Coy's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"quiet, calm, reserved"
"courage, bravery"
"nobleman of the second rank"
"peaceful ruler"
"new house, bright"
"God is gracious (if related to John)"
"reputation, esteem"
"little fire"
"short form of Nathan/Nathaniel"
"from the River Irvine"
"the brave ones, the warriors"
"son of Jack"
"modern blend: bright house, highest point"
"from Leicester"
"noble birth, upper class"
"high settlement or estate"
"army guard, protecting warrior"
"to move swiftly, energetic forward movement"
"of the wood, forest-born"
"bright pledge, noble hostage"
"invented name; possibly son of the fearless one"
Similar sound: These names share phonetic patterns with Coy — 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 Coy.
Rhythm: Coy is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.