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"
"the essential point, heart of the matter"
"created by Anu (sky god)"
"gift of God"
"with great strength (via Arion)"
"friend, lover (of God)"
"God's gift"
"the monk"
"spear strength"
"chaplain, keeper of the chapel"
"divination, prophecy"
"ruler of the land"
"bright one"
"water farmstead"
"eagle, noble"
"cypress tree"
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.