Grieg is a Norwegian surname originating from the Scottish surname Greig, notably Alexander Greig, great-grandfather of Edvard Grieg. The spelling "Grieg" reflects the Scots pronunciation of "Greig" at the time the name migrated. (In Scots, ei is regularly pronounced 'ee', e.g. heid [=head].) Notable people with this surname include the following:
References
Grieg (surname) Wikipedia(Text) CC BY-SA