Ísleifsson From Wikipedia, the free encyclopedia Ísleifsson is an Icelandic patronymic surname. Gissur Ísleifsson (1042–1118), Icelandic clergyman Ólafur Ísleifsson (born 1955), Icelandic economist and politician See also Leifsson Surname listThis page lists people with the surname Ísleifsson. If an internal link intending to refer to a specific person led you to this page, you may wish to change that link by adding the person's given name(s) to the link. Related Articles