Lenny sits next to 4 phonetic neighbors — Kenny, Benny, and Denny are the closest matches by sound. Most share Lenny's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"brave lion, lion-hearted"
"tumult, noise"
"lover of God"
"place of elms"
"royal power, royal ruler"
"modern spelling of Coe (jackdaw bird)"
"modern blended name"
"growth, abundance, increase"
"crooked enclosure"
"rye land; land where rye grows"
"son of Peter (son of the rock)"
"gift of God"
"joy, laughter"
"dear, beloved (associated folk etymology)"
"handsome, radiant one"
"one who builds"
"bold place, wild settlement"
"people's champion"
"battle, warrior"
"he who resembles God (rhetorical)"
Similar sound: These names share phonetic patterns with Lenny — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Germanic via Old English origins, giving them the same cultural heritage as Lenny.
Rhythm: Lenny is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.