I did not researched this clan to this time. As I know, they were farmers, may be bricklayers or carpenters and s.o.
It is possible to search about them in the parish registers to about 1650. I am not sure, but they were perhaps in before this year there.
Spanov village was the ownership of Domazlice king's town in that time.
For more information contact me directly.
All the best from Czech.