Allgar \a-ll-gar\ as a boy's name is a variant of Alger (Old English), and the meaning of Allgar is "elf spear". The baby name Allgar sounds like Ellgar, Allger and Algar. Other similar baby names are Allvar, Alamar, Alomar, Elgar, Alga, Alltair, Alvar, Allmer and Aylmar.