Birgir m. A derivative of Old Icelandic birgja 'to furnish, provide'.

Sweden

Latin

● 1251 Byrgerus (nom) CDL-1.1.1 XXII; 1315 Birgerus (nom) SDHK 2688; 1350 Birgers (gen) ibid. no. 6015, Birgheri (gen) ibid. no. 6000, Birghero (abl) ibid. no. 6023, Birgherum (acc) ibid. no. 6023, Birgirz (gen) ibid. no. 6002, Byrgeri (gen) ibid. no. 6020, Byrgero (abl) ibid. no. 6020, Byrgerus (nom) ibid. no. 6002, Byrghero (dat) ibid. no. 6030, Byrghys (gen) ibid. no. 6020; 1383 Birgerus (nom) SRA-vol2 no. 1901

Old Swedish

● 1361 Byrge (nom) SDHK no. 7885; 1373 birgers (gen) ibid. no. 10307; 1377 Birghe (nom) ibid. no. 11085; 1379 Birghe (gen) ibid. no. 11470; 1383 Birger SRA-vol2 no. 1913, Birghe (nom) ibid. no. 1925, Birgher ibid. no. 1903; 1402 Birgher (nom) SDHK no. 15899; 1408 Birghe (nom) ibid. no. 17116; 1414 Birghe (nom) ibid. no. 18236; 1418 Byrger (nom) ibid. no. 19083; 1419 Byrger (nom) ibid. no. 19273, Byrgyrs (gen) ibid. no. 19273