Constantine sits next to 4 phonetic neighbors — Constantin, Konstantin, and Constantino are the closest matches by sound. Most share Constantine's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"firm, unwavering"
"the Persian"
"from Germany"
"warrior, battle"
"place of lime trees"
"bright warrior, famous warrior"
"dove"
"from the Paulus family"
"one who works the earth"
"heart, spirit"
"sun, lord"
"people's champion, victorious one"
"from Scotland, Scotsman"
"hero (cultural/gaming)"
"descendant of Aodh (fire)"
"hero, protector (fictional)"
"thunder ruler"
"greatest stream (via Maxwell)"
"liberator, deliverer"
"modern coined name, variant of Kyson"
"that which is true or real"
Similar sound: These names share phonetic patterns with Constantine — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Constantine.
Rhythm: Constantine is a 4-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.