Willy sits next to 4 phonetic neighbors — Billy, Willie, and Will are the closest matches by sound. Most share Willy's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"resolute protector, determined guardian"
"distinguished leader"
"God is gracious (John) + beloved (David)"
"bird-like, of the birds"
"narrow channel (from Kyle)"
"son of Aodh (fire)"
"thicket, small wood"
"Yahweh is my strength"
"manly, strong"
"hollow stone, hollow hill"
"born of fire, handsome chief (via Kenneth/Cionaodha)"
"gift from God, he who is sent"
"mythical bird of rebirth"
"healer (via Jason)"
"faith, reliance, confidence"
"destroyer"
"handsome, well-born"
"outlaw, pursued one"
"from the Roman city of Lindum"
"son of the fair hero"
"a group of birds, especially quail"
Similar sound: These names share phonetic patterns with Willy — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Germanic origins, giving them the same cultural heritage as Willy.
Rhythm: Willy is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.