Family name Sirja (Sirja 
) , in the entire world, is a rare last name. The family name Sirja is characteristic of Indonesia, where it is a very rare surname, Malaysia, and Nigeria, where it is an extremely rare surname. In absolute terms, it is the most numerous in Indonesia, India, and Nigeria. More frequently, Sirja is the forename as well as the last name.
Sk, Eggert, Wright, Yakubu, Korpela, Kunnari, Pasanen, Pesonen, Peixoto, Tiainen, Rahikka, Noponen, Oksanen, Moilanen, Sulakatko, Rissanen, Lepistö, Toroskainen, Niininen, Hietanen, Salokanta, Hiipakka, Kangas, Attila, Leino, Bai, Shek, Berg, Khan, Paju, Rani, Rihu, Devi, Lima, Hije, Vadi, Vati, Singh, Sinha, Siren, Aikio, Aalto, Kumar, Ryhänen, Dahal, Gupta, Luomaniemi, and Honkasalo