Leonardo sits next to 3 phonetic neighbors — Leonard, Leandro, and Lorenzo are the closest matches by sound. Most share Leonardo's Italian-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"brave as a lion"
"hunter, pursuer"
"wood, forest; man of the forest"
"blazing iron"
"son of the beloved one"
"protector of people"
"God has heard"
"Lord, have mercy (liturgical)"
"son of Hudd"
"broad valley, broad hillside"
"from the brook"
"supplanter"
"messenger"
"sun, throne"
"God's gift"
"of uncertain origin, possibly barberry hill"
"little fire"
"permanent, long-lived"
"gentle, beloved"
"brave in war"
"western farmstead, western settlement"
Similar sound: These names share phonetic patterns with Leonardo — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Italian from Germanic (Leonard) origins, giving them the same cultural heritage as Leonardo.
Rhythm: Leonardo is a 4-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.