Birgitta is the Swedish and Icelandic form of the Irish Gaelic female name Brighid. Brighid or Brigid was the name of an ancient Celtic goddess, and its English form is Bridget. Birgitta and its alternate forms Birgit and Britta became common names in Scandinavia because of St. Bridget of Sweden. People named Birgitta. Birgitta Dahl (born 1937), retired Swedish politician. Bridget of Sweden (c. 1303 – 23 July 1373), Swedish Roman Catholic saint. Princess Birgitta of Sweden (born 1937), elder sister of King Carl XVI Gustaf. Birgitta Durell (1619–1683), Swedish industrialist.
https://en.wikipedia.org/wiki/Birgitta