Wilhelm sits next to 3 phonetic neighbors — William, Willem, and Vilhelm are the closest matches by sound. Most share Wilhelm's German-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"resolute protector"
"sharp, precise, swift (symbolic interpretation)"
"bright will, shining desire"
"night"
"grove dweller, one who lives near a grove"
"Brad's farm or town"
"from Rome, Roman citizen"
"gift of God"
"outlaw, pursued one"
"supplanter"
"from Kelso (place name)"
"gift of God"
"peace"
"God has heard"
"baker, bread maker"
"skilled leader, one who knows (English surname origin)"
"one who cuts"
"ocean, sea (from Kai)"
"one who lives by hawthorn bushes"
"firm belief in reliability"
Similar sound: These names share phonetic patterns with Wilhelm — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old High German origins, giving them the same cultural heritage as Wilhelm.
Rhythm: Wilhelm is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.