Renny sits next to 5 phonetic neighbors — Benny, Kenny, and Lenny are the closest matches by sound. Most share Renny's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"powerful ruler"
"one who rules by the spear"
"valley peace; combination of Del (valley) and Fred (peaceful ruler)"
"blessed ring, white circle (Welsh derivation)"
"spear of strength"
"rock, crag, cliff"
"ever powerful"
"white ford, ford of joy"
"the king"
"Courteous, polite, of the court"
"broad fortified settlement"
Similar sound: These names share phonetic patterns with Renny — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Germanic origins, giving them the same cultural heritage as Renny.
Rhythm: Renny is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.