Wilbur sits next to 4 phonetic neighbors — Gilbert, Wilber, and Walter are the closest matches by sound. Most share Wilbur's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"resolute fortress, determined will"
"new, fresh"
"deer, little deer"
"lion"
"mind, heart, spirit"
"occupational name for a blacksmith or farmer"
"God is gracious"
"rational thought, good judgment"
"healer (via Jason/Greek root)"
"to conquer"
"valley dweller"
"peaceful pledge"
"free man"
"modern invented name, variant of Cole/Colson"
"hollow, small cavity"
"from the hollow farm"
"God is gracious"
"land of Eoghan (Owen)"
"bent grass clearing"
"stone-like, hard, steadfast"
"imperial title, emperor"
Similar sound: These names share phonetic patterns with Wilbur — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old English origins, giving them the same cultural heritage as Wilbur.
Rhythm: Wilbur is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.