David Carnegie Andrew Agnew, Protestant Exiles from France… (1886)
“ There is another family of this name in the Canterbury registers. I may here remark that the final x being mute, and the two letters s and i alone being pronounced, like the English word see, this surname was liable to be spelt in a great variety of ways. Anthoine Sys was an elder in Canterbury, and died there on 26th June 1603; he is described, according to my correspondent, as sel ancien — perhaps the registrar meant to write feu ancien (late elder) . Anthoine’s son, Thomas Six, is described in the Canterbury French Church register as a native of Nauville ”
