Proto-Slavic *blъxa

→ Belarusian блыха (inherited)

→ Bulgarian бълха (inherited)

→ Czech blecha (inherited)

→ Lower Sorbian pcha (inherited)

→ Lower Sorbian bcha (inherited)

→ Upper Sorbian pcha (inherited)

→ Hungarian bolha (cognate)

→ Macedonian болва (inherited)

→ Old East Slavic блъха (inherited)

→ Polish pchła (inherited)

→ Russian блоха (inherited)

→ Serbo-Croatian buha (inherited)

→ Serbo-Croatian buva (inherited)

→ Serbo-Croatian бува (inherited)

→ Slovak blcha (inherited)

→ Slovene bolha (inherited)

→ Ukrainian блоха (inherited)

→ Slovincian pχlȧ̃ (inherited)