Morag is the spider queen in one of the Magic Tree House books by Mary Pope Osborn. She isn't a very famous bearer (she's only in the one book, "Summer of the Sea Serpent") but that's the only time I was exposed to it. So unfortunately I always associate this with helpful giant spiders. :(
Morag MacDougal is indeed a minor Harry Potter character. She is in Harry's year at school, though she is a Ravenclaw pureblood. She was not a member of Dumbledore's Army, and J. K. Rowling changed her mind twice about her name.The literal meaning of “Morag” is “the sun.”
― Anonymous User 4/22/2007
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If I recall correctly, Morag MacDougall is a minor character in Harry Potter.