[1] He was born on the farm Gautlönd in north east Iceland and two of his brothers became politicians, Pétur (28 August 1858 – 20 January 1922, member of Althingi 1894–1922, minister of Industrial Affairs 1920–1922) and Steingrímur (27 December 1867 – 29 December 1956, member of Althingi 1906–1915).

Kristján was the father in law of Sigurður Eggerz, who later took office as Minister for Iceland.

He is the great-grandfather of Icelandic footballer Jón Böðvarsson.

Kristján died at his home in Reykjavík on 2 July 1926.

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