The world of Westeros has an interesting custom - if you are a bastard, you cannot take your father's surname. Instead, you are given a generic last name, depending on what region you were born in. Those in the icy North get "Snow" (like Jon Snow), those in sunburnt Dorne get "Sand" (like Ellaria Sand, Oberyn's paramour), etc. Here's a full list:

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via Game of Thrones Wiki

 

But what about America? What if America followed this custom too? RandyRants has broken down the ol' continental US of A (sorry Hawaii and Alaska) and figured it out:

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