Guðmundur was born 15 March 1851 at Eydi, Seltjarnarnesthing, Gullbringu. His parents are Egill Gunarsson, born 20 October 1811; and Ingveldur Egilsdottir, born 1811. He married Gudridur Gudmundsdottir 26 October 1873 in Reykjavik. They met Mormon missionaries and became members of The Church of Jesus Christ of Latter-day Saints, being baptized by Elder Jacob B. Jonsson 8 January 1881.
In July of 1881 Gudmundur, Gudridur and their son Eirikur left Iceland with Elders Jon Eyvindsson and Jacob B. Jonsson and a group of about twenty Icelandic Latter-day Saints. They arrived in Salt Lake City 7 August 1881. They then went to Spanish Fork, Utah. Gudmundur bought land in Spanish Fork. Gudmundur passed away 8 October 1889 and is buried in the Spanish Fork, City Cemetery. He is number 70 in Icelanders of Utah.
