When Fokeltje Sijbrens Elgersma was born on 6 August 1851, in Lollum, Friesland, Netherlands, her father, Sijbren Fetzes Elgersma, was 21 and her mother, Aagje Jans Wijnia, was 18. She married Bauke Klazes Wijbrandi on 12 May 1874. They were the parents of at least 4 sons and 4 daughters. She died on 28 November 1936, in Oosterend, Friesland, Netherlands, at the age of 85.
West Frisian: patronymic, formed with the suffix -ma ‘(one of the) men of’, from a genitivized form of the personal name Elger, from ancient Germanic Agilger (composed of the elements agil ‘point, edge (of a sword)’ + gēr ‘spear’) or Adalger (from adal ‘noble’+ gēr ‘spear’).