Constantino sits next to 3 phonetic neighbors — Constantine, Constantijn, and Agustino are the closest matches by sound. Most share Constantino's Spanish-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"constant, steadfast, resolute"
"by the sea"
"Greek man"
"Little Juan; affectionate diminutive of Juan (John)"
"from Sebastia"
"from the Brazos River, Texas"
"great, venerable, magnificent"
"God sees, God beholds"
"God is gracious"
"son of prophecy"
"gift of God"
"order, beauty, universe"
"of the mountain, from the mountain"
"little cross"
"the greatest, most excellent"
"heavenly, of the sky"
"one who tames"
"place of glamour and royalty (associative)"
Similar sound: These names share phonetic patterns with Constantino — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Constantino.
Rhythm: Constantino is a 5-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.