The Old Norse form of the name became Þjóðríkr ( spelled þiaurikʀ on the 9th-century Rök Runestone ) . This was `` Tjodrik '' in Middle Norwegian .
The Old Norse form of the name was Þjóðríkr ( spelled þiaurikʀ on the 9th-century Rök Runestone ) . This became `` Tjodrik '' in Middle Norwegian .