Rudy sits next to 4 phonetic neighbors — Rudie, Ruby, and Buddy are the closest matches by sound. Most share Rudy's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"famous wolf"
"from the isle"
"elf counsel, wise counselor"
"God supports, Yahweh supports"
"Saint Anne"
"immortal, divine"
"dark-skinned, Moorish"
"God is salvation"
"fire (Irish equivalent Aodh)"
"dark-skinned, Moorish"
"a narrow road or lane"
"protector of people"
"eager for battle"
"industrious, strong"
"one who helps"
"brave warrior (later folk etymology)"
"shepherd, one who tends sheep"
"dweller near the heath"
"benevolent warrior"
"wealthy guardian, guardian of fortune"
"loved, beloved"
Similar sound: These names share phonetic patterns with Rudy — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Germanic origins, giving them the same cultural heritage as Rudy.
Rhythm: Rudy is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.