Change your surname to a domain that is available…
Of course I am kidding, but this kind of thing happens a lot, and it just ends up costing money to sort out. If you are happy with that then do it - if not then you will have to hope it becomes available on the free market at some time or see if it comes available in domain auctions as said. It really is that hit or miss, unless you are a Jones or Smith in which case there is zero chance