what is g's name in ncis la
G. Callen In season seven, Callen admits that he and Joelle are not suited and rowing a lot. They break up off screen but still spend Christmas together to avoid being lonely. In "Matryoshka, Part 2", Callen meets his father in Russia who reveals that his birth name is Grisha Alekandrovich Nikolaev but had to leave before he could find out any more information. Callen has since updated his personnel records and credentials with his full name.[1]