Serbo-Croatian tko

← Proto-Indo-European *kʷos (derived)

← Proto-Indo-European *kʷid (mention)

← Proto-Indo-European *kʷis (mention)

← Proto-Slavic *kъto (inherited)

→ Serbo-Croatian tkogod (suffix)

→ Serbo-Croatian itko (prefix)

→ Serbo-Croatian svatko (prefix)