José Arcadio Aureliano who???
To make things a little less confusing, I will indicate the generation people belong to with I, II and III in between brackets. Generation I is José Arcadio Buendía and Úrsula Iguaran, generation II are their sons and (adopted) daughters and generation III are their grandchildren. Note also that the only one for whom the author uses the last name (Buendía) is the first José Arcadio. His son may have the exact same name but is never named by first and last name