Koy sits next to 3 phonetic neighbors — Roy, Coy, and Koi are the closest matches by sound. Most share Koy's Dutch-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"victorious people"
"phonetic American invention"
"great (via Chinese Quan)"
"little poet; philosopher"
"handsome, born of fire"
"measured flow, regular beat"
"lord, nobleman"
"clerk, scholar, scribe"
"brave, courageous"
"man, mankind, mortal"
"oak tree"
"one who strides, ranger, wanderer"
"wood, lumber, forest"
"discerning, perceptive"
"bright, brilliant"
"rain, precipitation"
"dog (loyal companion)"
"at the ford (river crossing)"
"from the heathland"
"one of the Franks (a Germanic tribe)"
"son of Aodh (fire)"
Similar sound: These names share phonetic patterns with Koy — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek via Dutch origins, giving them the same cultural heritage as Koy.
Rhythm: Koy is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.