Third in a Series: What's in a Surname?

We started by talking about first names. Then we talked about middle names (or the lack thereof). To wrap up the theme tell us about your last name. I'm assuming you all have one. I doubt Sting, Bono, or Cher are hanging out around here.

The true name of the House of Hatrack comes from a word meaning Cross. Ironic, considering my confirmed atheism. I can't give you much history on it. It came across the ocean with one of the Hatrack Emeritus' great-grandfathers but I couldn't tell you which one or which of three different countries he came from.