Will sits next to 4 phonetic neighbors — Bill, Phil, and Gil are the closest matches by sound. Most share Will's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"resolute protector"
"strength, vigor"
"helmet of will, guardian"
"divine protection"
"he who causes distress"
"charcoal, dark"
"savior"
"son of the prince/lord"
"peace, security"
"modern invented name, possibly dark one"
"salvation of the Lord (via Isaiah element)"
"carrier, one who bears"
"wolf counsel"
"salvation of God"
"wealthy guardian"
"pure (short for Catherine)"
"pointed hill"
"rigid airship (named for Count Ferdinand von Zeppelin)"
"dream, aspiration, vision"
"power of the tribe"
Similar sound: These names share phonetic patterns with Will — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Germanic origins, giving them the same cultural heritage as Will.
Rhythm: Will is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.