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The name Roswall is Swedish surname believed to originate from the Swedish Island of Gotland. There are severals families with the name that have no relatives in common but it's a fairly unusual last name. It can be spelled both with a "Roswall" and "Rosvall". The american last name "roswell" is a american version of "Roswall" that the Swedish immigrants created. They wanted a "English" sounding last same so they changed the "a" to a "e". This is not uncommon.