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"
"jet-black, swift"
"mountain goat, to ascend"
"born of fire"
"remedy, cure (folk etymology)"
"God shall add (another son)"
"wolf lover"
"God's darling"
"the king"
"battle chieftain (Cerdic interpretation)"
"divine staff, royal pillar"
"open, beginning"
"dedicated to Mars"
"power, strength, ruler"
"noble readiness"
"Lord have mercy (liturgical)"
"prince, chieftain"
"wild rose, thorny shrub"
"God is salvation"
"the number seven, representing luck and completeness"
"Yahweh has created"
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.