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"
"one who burns, charcoal burner, distiller"
"morally right, virtuous, just"
"wholehearted, all heart, faithful"
"hollow stone, hollow hill"
"day"
"white settlement, white farm"
"watchman, alert"
"hawthorn tree, thorny hedge enclosure"
"bright will, shining desire"
"the king"
"night"
"son of Dionysus"
"son of Will"
"son of Jack"
"strong, firm, enduring"
"craftsman, skilled maker"
"special, particular (German root)"
"Thor's stone"
"reddish-brown color"
"white heart, blessed heart"
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.