Leonhard sits next to 4 phonetic neighbors — Leonard, Leonhard, and Lennard are the closest matches by sound. Most share Leonhard's German-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"lion-hearted, brave as a lion"
"God's gift"
"short form of Ari (lion) or Aaron (high mountain)"
"ruler of the land"
"the essential point, heart of the matter"
"lord of the earth, creation of the good earth"
"lion (via Ari root)"
"prince, commander"
"water farmstead"
"settlement on a hill"
"occupational surname for a chapel keeper"
"vigilant in battle, watchful"
"the monk"
"prayer"
"fair, white, bright"
Similar sound: These names share phonetic patterns with Leonhard — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old High German origins, giving them the same cultural heritage as Leonhard.
Rhythm: Leonhard is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.