My name's Richard Guillaume. I 'm French from North East France and Lorraine.
An autosomal match at FTDNA gave me a match with a Swedish man, Mr. Bengt E.
It turns out that one of Mr. E. ancestor was Mr. Toussaint Guillaume, born near Liege in Today's Belgium around 1586.
I have no paper record of Mr. Toussaint Guillaume because my paper trail stops in a small church in Lorraine circa 1736.
However my paternal family lore claims that our paternal ancestor came from the Netherlands and the south part of the Netherlands near Liege became part of Belgium in the 1600s. It is therefore very possible that Toussaint Guillaume was a relative of my paternal ancestor, perhaps even my own Paternal ancestor.
Anyways, the story continues like this. Mr Toussaint Guillaume moved to Sweden around 1620, with his wife and several of his children. He is recorded in Uppsala in Sweden in 1627 as a metal worker. Once in Sweden, Toussaint changed his name to Gilljam.
It is likely that any man whose ancestry goes back to the Gilljams of Sweden circa 1627 goes further back in time to Guillaume or Guilheaume in Belgium and Netherlands prior to 1600.
In addition, assuming that Toussaint Guillaume/Gilljam is paternally related to me, then he must have been of the same Y Haplogroup as mine : R1b-M269-DF27-CTS4065-BY12176.
I encourage the R1b or R-M269 men from this name-group who think that their ancestry are the Netherlands or Sweden post-1620, to get a SNP pack test at FTDNA or elsewhere. Providing our respective STR pattern were good match, at least at the 37 STR marker level, which you can see if you are in the 'Gilliam' name-group at FTDNA, then I suggest you can try the Z209 SNP pack at FTDNA.