<P> On 1 November 1455 , John Beaufort 's granddaughter , Margaret Beaufort , Countess of Richmond and Derby , married Henry VI 's maternal half - brother Edmund Tudor , 1st Earl of Richmond . It was his father , Owen Tudor ( Welsh : Owain ap Maredudd ap Tudur ap Goronwy ap Tudur ap Goronwy ap Ednyfed Fychan ) , who abandoned the Welsh patronymic naming practice and adopted a fixed surname . When he did , he did not choose , as was generally the custom , his father 's name , Maredudd , but chose that of his grandfather , Tudur ap Goronwy , instead . This name is sometimes given as Tewdwr , the Welsh form of Theodore , but Modern Welsh Tudur , Old Welsh Tutir is originally not a variant but a different and completely unrelated name , etymologically identical with Gaulish Toutorix , from Proto - Celtic * toutā `` people , tribe '' and * rīxs `` king '' ( compare Modern Welsh tud `` territory '' and rhi `` king '' respectively ) , corresponding to Germanic Theodoric . </P>
<P> On 1 November 1455 , John Beaufort 's granddaughter , Margaret Beaufort , Countess of Richmond and Derby , married Henry VI 's maternal half - brother Edmund Tudor , 1st Earl of Richmond . It was his father , Owen Tudor ( Welsh : Owain ap Maredudd ap Tudur ap Goronwy ap Tudur ap Goronwy ap Ednyfed Fychan ) , who abandoned the Welsh patronymic naming practice and adopted a fixed surname . When he did , he did not choose , as was generally the custom , his father 's name , Maredudd , but chose that of his grandfather , Tudur ap Goronwy , instead . This name is sometimes given as Tewdwr , the Welsh form of Theodore , but Modern Welsh Tudur , Old Welsh Tutir is originally not a variant but a different and completely unrelated name , etymologically identical with Gaulish Toutorix , from Proto - Celtic * toutā `` people , tribe '' and * rīxs `` king '' ( compare Modern Welsh tud `` territory '' and rhi `` king '' respectively ) , corresponding to Germanic Theodoric . </P>
where did the name house of tudor come from
where did the name house of tudor come from
Tudur ap Goronwy
Tudur ap Goronwy