The name Morag is a girl's name meaning "great". Morag and is often added to lists like Baby Names from Children's Books and discussed in our forums with posts like "A brother or sister for little Jack or Olivia".
From the experts:
Morag is a quintessential Scottish feminine name. Actually a diminutive of Mor, it has always been used more than the original. Commonly heard in Scotland, but could lead to pronunciation problems elsewhere, and the second syllable could prove very confusing. Morag is sometimes used as the Gaelic equivalent of Sarah. In the Harry Potter books, Morag MacDougal was a witch who attended Hogwarts in the same year as Harry.