Cub sits next to 4 phonetic neighbors — Cobb, Cub, and Cal are the closest matches by sound. Most share Cub's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"young bear, young animal"
"one who experiences joy and music"
"cinema; motion picture"
"Hugh's meadow or clearing"
"from Leicester (Roman fort on the River Leir)"
"refinement, subtlety"
"man from Hadria"
"to make famous"
"exalted by God"
Similar sound: These names share phonetic patterns with Cub — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Norse kubbr via English origins, giving them the same cultural heritage as Cub.
Rhythm: Cub is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.