Porsa — colony in Wilejka powiat Wilno Voivodeship of Polish Republic (Second Rzeczpospolita, 1920-1939).
Information presented on the Radzima.net: 
Catholic parish to which the colony Porsa belonged at the beginning of the 20th century;
metrical books of the Catholic parish on births, marriages and deaths (with indication of years, fund, inventory and archive where parish registers kept);
Location of the colony Porsa
— geographic coordinates and depiction of the colony Porsa on early-20th-century detailed maps, modern maps, and satellite imagery (Google Maps). Administrative affiliation of the colony Porsa
— the administrative-territorial units to which the settlement belonged in different historical periods:— Polish Republic (Second Rzeczpospolita, 1920-1939), Catholic parish to which the colony Porsa belonged at the beginning of the 20th century;
metrical books of the Catholic parish on births, marriages and deaths (with indication of years, fund, inventory and archive where parish registers kept);
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"Порса-с. Вилейского р-на. Название сопоставимо с финской основой porsas-поросёнок. В топонимии,вероятно вторичного происхождения ч-з балтийские языки от фамилии, производной от той же основы. "
В. А. Жучкевич "Краткий топонимический словарь Белоруссии" БГУ 1974г. reply
2013-02-24 Егор Каминский