The names of places are and always have been spelled differently in different languages.Just as the place name Washington in English in Lithuanian is Vas^ingtonas, so the place name in present day Lithuania is Vilnius -- as spelled by the Lithuanians.It is spelled Vilna by Russians, Wilno by Poles, Vilne in Yiddish, Wilna by the Germans.It was always called by these names by the different ethnic groups.It all depends on whose viewpoint you are speaking from.If you are German, then you'll likely call it Wilna.
During the Russian Empire (1795 - 1917), this city and the land south of it, extending well into present day Belarus, was part of the Russian province (called a gubernia) by the same name.So if someone was said to be from "Swirowo, Wilno" it means that a Polish spelling is being used.The "Wilno" would be the province of that name that belonged to the Russian Empire and Swirowo would have been in that province.(See this map to see the boundaries of these lands during the Empire and afterwards: http://www.jewishgen.org/databases/Lithuania/images/LithuaniaRegions.gif)http://www.jewishgen.org/databases/Lithuania/images/LithuaniaRegions.gif).
The gubernias during the Empire were divided into 7 districts called uyezds.The uyezds of the Vilnius province were named for the largest town within its boundaries.You will see that Svir was in the uyezd of Sventsyany (S^venc^ionys in Lithuanian).They were:
DISNA (Towns today in Belarus were: Druya (Druja) [Bel], Germanovichi (Hermanowicze) [Bel], Hlybokaye (Glebokie) [Bel], Luzhki (Luzki) [Bel], Pastavy (Postawy) [Bel], Sharkowshchyna (Szarkowszczyzna) [Bel].)
LIDA (Towns today mostly in Belarus were: Belitsa (Bielica) [Bel], Eis^is^kes (Ejszyszki), Novyy Dvor (Nowy Dwor) [Bel], Ostryna [Bel], Radun (Radun) [Bel], Rozhanka (Rozanka) [Bel], Schuchyn (Szczuczyn) [Bel], Vasilishki (Wasiliszki) [Bel], Voranava (Woronow) [Bel], Zheludok (Zoludek) [Bel].
OSHMYANY (Towns today mostly in Belarus were: Towns: Dievenis^kes (Dziewieniszki), Golshany (Holszany) [Bel], Ivye (Iwje) [Bel], Krevo (Krewo) [Bel], Lipnishki (Lipniszki) [Bel], Smarhon (Smorgonie) [Bel], Soly (Soly) [Bel], Traby [Bel], Valozhyn (Wolozyn) [Bel], Vishnevo (Wiszniew) [Bel].)
VILEJKA (Towns today in Belarus: Dolginovo (Dolhinow) [Bel], Dunilovichi (Dunilowicze) [Bel], Gorodok (Grodek) [Bel], Ilya (Ilja) [Bel], Krivichi (Krzywicze) [Bel], Kurenets (Kurzeniec) [Bel], Lebedevo (Lebiedziew) [Bel], Maladzyechna (Molodeczno) [Bel], Myadzyel (Miadzol Nowy) [Bel], Radoshkovichi (Radoszkowicze) [Bel], Vyazyn (Wiazyn) [Bel].)
SVENTSYANY (Towns partly in Belarus, partly in Lithuania: Adutis^kis (Hoduciszki), Ignalina (Ignalino), Linkmenys (Lyngmiany), Narach (Kobylnik) [Bel], S^venc^ioneliai (Nowo-Swieciany), Svir (?wir) [Bel].
TROKI (Towns all in present day Lithuania: Alytus (Olita), Daugai, Butrimonys, Merkine (Meretch), Staklis^kes (Stoklishki), Valkininkai (Olkieniki), Var?na (Orany), Vievis, Žasliai (Zhosli), Z^iez^mariai (Zhezmir).
VILNA (Towns all in present day Lithuania: Mais^iagola (Mejszagola), Mikhalishki (Michaliszki) [Bel], Moletai (Malaty), Nemenc^ine (Niemenczyn), S^alc^ininkai (Soleczniki Wielkie), S^irvintos (Shirvint)
After WWI, the newly independent Poland invaded these lands and the city of Vilnius and occupied them until WWII, even though the international community had agreed that part ofthese lands should be part of the newly created country of Lithuania and part of Belarus.