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Seirijai toponym came from the lake Seirijis, which got its name from the creek Seira name of which is of Yotvingian origin. Derivative names in other languages are - Polish: Sereje, German: Serrey, English sometimes "Serey"
The lands were inhabited by the Baltic tribe Yotvingians. Due to the frequent raids and pillaging of Teutonic Order, Yotvingians abandoned the lands and Seirijai became a wilderness. From 1383 to 1398 Seirijai was in the State of the Teutonic Order. After the defeat of Teutonic Order in the Battle of Grunwald and the Treaty of Melno (1422), the land became populated again and started to grow economically. Since 16th century Serijai were known as a proprietary land of a ruler. King of Poland and Grand Duke of Lithuania Sigismund I the Old donated Seirijai to Jurgis Radvila, and later it became a possesion of Radvila family. Jurgis Radvila built a Catholic church in 1537. Already in 1564 the church was given to Calvinists, since many in Radvila family converted to Calvinism. The tensions between Catholics and Calvinists lasted up to 1655 the Thirteen Years' War with Russia. Seirijai town was devastated and Calvinists retreated.
During the World War II almost all Seirijai was bombed by German army.
On September 11, 1941, 953 Jews from Seirijai were murdered in the Baraučiškės Forest, including 229 men, 384 women and 340 children. The mass execution was perpetrated by Rollkommando Hamann (Lithuanian: skrajojantis būrys, a small mobile unit that committed mass murders of Lithuanian Jews in the countryside in July–October 1941, with a death toll of at least 60,000 Jews.) / 1st Battalion 3rd Unit led by Norkus and Obelenis; Lithuanian Activists Front members from Seirijai 
Company Seirijų žirgai, which keeps and breeds Trakehner horses.
- Alexander Ziskind Maimon (1809–1887) – Lithuanian Jewish author and scholar of the Talmud.
- Antanas Žmuidzinavičius (1876–1966) – Lithuanian painter.
- Bronius Kazys Balutis (1880–1967) – Lithuanian diplomat.
- Juozas Adomonis (g. 1932) – artist, ceramicist.
- Vidas Kavaliauskas (g. 1965) – Lithuanian linguist.
- "2011 census". Statistikos Departamentas (Lithuania). Retrieved August 13, 2017.
- "Serey (Seirijai)". JewishGen KehilaLinks. 5 April 2000. Retrieved 6 January 2019.
- Petrauskas, Juozas. "Seirijai". www.spauda.lt. Retrieved 4 September 2019.
- Melamed, Joseph A. "The Mechanized Commando Unit of Haman". Association of Lithuanian Jews in Israel. Retrieved 2009-03-14.
- Dean, Martin C. (2004). "Local Collaboration in the Holocaust in Eastern Europe". In Stone, Dan (ed.). The Historiography of the Holocaust. Palgrave Macmillan. p. 127. ISBN 978-1-4039-9927-6.
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