Cubby sits next to 3 phonetic neighbors — Cubbie, Tubby, and Bobby are the closest matches by sound. Most share Cubby's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"young bear, small animal"
"blessed ring, white circle (Welsh derivation)"
"noble, of noble type"
"rocky ground"
"old river, ancient waters"
"renewed in spirit"
"golden brown; tawny"
"ever powerful"
"grey, grey-haired"
"label, identifying mark; to touch lightly"
"small fertile land plot"
"eminence, hill"
"dweller by a spring or well"
"lean, thin one"
"fond of horses"
"who is like God?"
"shield wolf (derived from Randy/Randolph)"
"broad fortified settlement"
Similar sound: These names share phonetic patterns with Cubby — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have English origins, giving them the same cultural heritage as Cubby.
Rhythm: Cubby is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.