Johan Martinsen Jorstad

This is pretty vague but my grandmother, Clara Mable Jorstad was the daughter of Johan Martinsen Jorstad born Mar30 1861 and Sigrid Prestrud born Dec 12 1855. She also said her grandfather's name was Martin Malmbecken. Both Johan and Sigrid were born in Norway and died in Canada. Clara lived most of her life in N.D. and was married to Daniel Lee Rich. Beyond this I have found nothing. I think the name Prestrud and Malmbecken may be farm names the same as Jorstad. Malmbecken doesn't follow the usual naming practice. Also have a thought that it may be Swedish. Can anyone help? Thanks