Surname Blaj (Balázs 
, Blaj 
, Блай 
) , across the world, is a common cognomen. The family name Blaj is characteristic of Eastern Europe, particularly Hungary, where it is quite a common surname, Romania, and Slovakia, where it is quite a rare surname. Likewise, Blaj is the forename as well as the last name.
| daniel blaj Doctor of Theology (b. 1973) |
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| marian blaj Romanian biathlete, RO (b. 1978) |
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| iulia blaj researcher (ORCID 0000-0002-8744-3415) |
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| lucian blaj Romanian politician from Seimeni, Constanța County, RO |
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| cristina blaj researcher |
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| sebastian blaj researcher (ORCID 0000-0001-5830-9797) |
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| g. blaj researcher |
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| georgeta blaj Romanian politician from Botești, Neamț County, RO |
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| olimpiu blaj Romanian actor, RO (b. 1986) |
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| ioana blaj actress, RO (b. 1987) |
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| žiga blaj SI |
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| mihaela blaj RO |
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| ștefan blaj RO |
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