Proto-Slavic *synъ

→ Old English sunu (cognate)

→ Belarusian сын (inherited)

→ Bulgarian син (inherited)

→ Czech syn (inherited)

→ Old Church Slavonic сꙑнъ (inherited)

→ Lower Sorbian syn (inherited)

→ Upper Sorbian syn (inherited)

→ Macedonian син (inherited)

→ Polish syn (inherited)

→ Romanian sin (borrowed)

→ Russian сын (inherited)

→ Rusyn сын (inherited)

→ Serbo-Croatian sin (inherited)

→ Serbo-Croatian син (inherited)

→ Slovak syn (inherited)

→ Slovene sin (inherited)

→ Ukrainian син (inherited)