I've done a lot of genealogy and to me, it seemed to be a fairly common name in the mid to late 1800s in America. I have personally encountered the name Permelia at least 8-10 times. It's not the prettiest name but it's certainly not the worst, especially if you have an open mind about names.
Not the most attractive of names, especially with the nickname my ancestress carried--Meeley (makes me think of bad bread). She was born in 1807 in Virginia, a slave, and was later freed.