The 'origin' of this custom/tradition is not known. = The 'origins' of this custom/tradition are not known. [=no one knows how this custom/tradition started]
He comes from 'humble origins'. [=he comes from a family that did not have high social status or much money]
The English word “rendezvous” is French 'in origin'. [=the English word comes from French]
(..) of a remodeled Colles' fracture on the left radius. Its presence suggests that the victim's father may have been telling the truth about the origin of his son's childhood injuries. So, after Brandon went missing, the room that he was renting just sat empty. Eventually, the kid's landlord (..)2016 TvShow: Bones Title: The Movie in the Making Season: 11 Episode 18