I don't know it. You are free to spell it out here. (do you mean SA Spurs....or TH Hotspurs? And what is a hotspur....beyond the obvious?)
The story is that we were originally formed from a cricket club called Hotspur Wanderers (or something similar) and became Hotspur FC. It's supposed to come from Harry Hotspur. Shakespeare wrote about him - he and his family are believed to have owned land nearby.
The Y nickname is, er, the Yids. We have long had connections with the Jewish community through both ownership and location. Just south of Tottenham is an area with a large Orthodox Jewish population. Similar to Ajax in the Netherlands, opposing teams viewed us as a "Jewish" club and would regularly chant about Hitler, make hissing (gas chamber) noises etc etc. Spurs fans adopted it as a badge of honour in an attempt to turn the abuse back on itself. It worked to an extent, except ironically there's an ongoing debate about whether it is offensive for Spurs fans to call themselves "Yids".
Gunners