Luca sits next to 4 phonetic neighbors — Luke, Lucas, and Luka are the closest matches by sound. Most share Luca's Italian-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"man from Lucania"
"son of Cole"
"gift of Yahweh"
"laughter, joy"
"whole-hearted, faithful"
"beloved, darling"
"From Hebrew 'Gavriel'; the archangel Gabriel appears in the Bible, ..."
"jet black; speed"
"great tide, wave"
"short form of Jason, the healer"
"Yahweh has shown favor"
"God has shown favor"
"protector of men"
"little red-haired one"
"Yahweh is deliverance"
"son of Jack"
"God will add"
"son of Aeson, the hero who sought the Golden Fleece"
"priceless, of inestimable worth"
"who is like God?"
"God-like"
Similar sound: These names share phonetic patterns with Luca — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Luca.
Rhythm: Luca is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.