Last name Mustafaj (Mustafaj 
) , globally, is quite a rare surname. The cognomen Mustafaj is habitual in Albania, where it is quite a common surname, Kosovo, and Slovenia, where it is a rare surname. Not in comparison with a country's population, it is commonest in Albania, Kosovo, and Italy.
| VARIANT | COUNTRY |
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| Mustafaj | Greece, Albania, Italy, Kosovo, United States |
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besnik mustafaj Albanian writer and diplomat, AL (b. 1958) |
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| bibjana mustafaj actress |
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| bashjke mustafaj college basketball player (1992–1993) Iona |
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| erjon mustafaj Albanian footballer, AL (b. 1989) |
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| mustafaj cazim |
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| aidena mustafaj Albanian association football player, AL (b. 1998) |
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Mr, Agon, Agim, Aida, Avni, Baki, Besa, Bosh, Romi, Redi, Deme, Demo, Debi, Dina, Dori, Gzim, Ladi, Ledi, Luan, Jona, Joni, Juli, Abni, Arbi, Ardi, Andi, Ali, Ani, Adi, Rea, Lim, Tea, Tim, Edi, Eri, Eni, Toni, Eva, Isa, Ola, Mark, Megi, Sara, Sabi, Sofa, Alba, Alma, Aldo, Ina, and Naim