Polish tęcza

← Lithuanian tánkus (cognate)

← Russian ту́ча (cognate)

← Serbo-Croatian ту̏ча (cognate)

← Serbo-Croatian tȕča (mention)

← Proto-Slavic *tǫča (inherited)

→ Bulgarian туча (cognate)

→ Polish tęczówka (suffix)

→ Polish Tęczyński (mention)

→ Polish Tęczyńska (mention)

→ Russian туча (cognate)