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"
"noble throne"
"Hugh's meadow or clearing"
"cinema; motion picture"
"to make famous"
"skillful delicacy, graceful handling"
"one who experiences joy and music"
"dark one, man from the dark sea"
"from Leicester (Roman fort on the River Leir)"
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.