How many ways can you spell the last name pearson?

ok my great grandmas maiden name was pearson and her husbands was mahoney. i heard there are other ways to spell pearson, how? and can you tell me the origins of these names? oh and the origins of these to: courtright, magrane, watkins, and bouvier. and just so you know, i am realted to jaqueline bouvier onis kennedy. :) I didnt know this til my mom told me. But please tell me and thanks :)