For those in first reply, it's not Muha and not Muva in Serbian language, it's Mušica. Some call it Muva but no one call it Muha.

Annoying fuckers

Musė in lithuanian

moscas

"Mistviecher" in German.

苍蝇 cangying, sounds a bit more like CHAHng-ying-

Moucha - in czech

Moscas , another spanish here :D

zippers

Moscas :D Portuguese

Lalat in Indonesia

Lalat in Bahasa Malaysia

Cang ying in Mandarin

Wu ying in Cantonese.

I don't know what it is in Hakka or Hokkien though. Shame.

I do not call flies for they annoy me.

Blowies - Big flies Australian
Marshie - Marsch flies in Australian
Flyin' Buggers - everything that flies Australina

i call them "mother fuckers" or " pieces of shit i kill you now"

Hokkien Dialect: Ho Sin (Hore Sin)

Here, have fun.

Otravná kurva in czech

Fliegen - german

蒼蠅 in Traditional Chinese

Zvuv - in Hebrew :D

"Légy" in Hungary :P

Zvovim in hebrew.

(pronounced Z-Voo-Veem)

파리 [pari] in korean, Paris is aswell called "pari"