 Researchers of this surname state that there are more Silverthorn's in the Toronto white pages and surrounding cemeteries than any other area in the world.Please refer to the 1982 Silverthorn History published by Frank Fremont Reed, with the English Origins co-authored by William D Silverthorn (both of California, USA).When Markland Wood was developed in the early 1960s, the Etobicoke Board of Education (the forerunner of the TDSB) decided to build a secondary school for the area.