Kosta sits next to 4 phonetic neighbors — Costa, Costas, and Kostya are the closest matches by sound. Most share Kosta's Greek-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"constant, steadfast"
"victorious one"
"strong, healthy"
"defender of mankind"
"man, warrior"
"crown, garland, wreath of honor"
"Titaness, mother of Apollo and Artemis"
"of Mars, warlike"
"heart, courageous heart"
"one who thinks ahead"
"king, royal"
"divine gift"
"chaos, conflict"
"lord, master"
Similar sound: These names share phonetic patterns with Kosta — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Kosta.
Rhythm: Kosta is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.