Dejan sits next to 3 phonetic neighbors — Dayan, Dajan, and Deion are the closest matches by sound. Most share Dejan's South Slavic-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"gift, given"
"one who dreams, visionary"
"glory, to celebrate"
"noble throne"
"the reinforced, the backed"
"generous, noble, honorable"
"the people, citizen"
"refinement, subtlety"
"God is with us"
"Hugh's meadow or clearing"
"cinema; motion picture"
"Effort; endeavor; to try"
"from Leicester (Roman fort on the River Leir)"
"God is gracious; Yahweh is gracious"
"wise and brave"
Similar sound: These names share phonetic patterns with Dejan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have South Slavic origins, giving them the same cultural heritage as Dejan.
Rhythm: Dejan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.