Proto-Slavic *-akъ

→ Bulgarian юнак (mention)

→ Macedonian јунак (mention)

→ Polish junak (mention)

→ Polish -ak (inherited)

→ Romanian poleac (mention)

→ Russian прачка (mention)

→ Russian -ак (inherited)

→ Russian двоякий (affix)

→ Serbo-Croatian junak (mention)

→ Serbo-Croatian јунак (mention)

→ Serbo-Croatian -iak (inherited(sh/sk))

→ Slovak -ák (inherited)

→ Slovak junák (mention)