It occurred to me to wonder where the name Pamela came from, so I went to my Dictionary of First Names (by Patrick Hanks and Flavia Hodges), where I found this entry:
Pamela (f.) English: invented by the Elizabethan pastoral poet Sir Philip Sidney (1554–86), in whose verse it is stressed on the second syllable. There is no clue to the sources that influenced Sidney in this coinage. It was later taken up by Samuel Richardson for the name of the heroine of his novel Pamela (1740). In Henry Fielding’s Joseph Andrews (1742), which started out as a parody of Pamela, Fielding comments that the name is ‘very strange’.
So now, in addition to pronouncing Byron’s hero “Don JOO-ən,” I have to remember to say “Pa-MEE-lə” for Richardson’s. I note that the Wikipedia article on the name says “It is widely thought that Sidney intended the name to mean ‘all sweetness’ having in mind the Greek words pan (‘all’) and meli (‘honey’),” but had that been the case he would surely not have stressed it on the second syllable, because meli has a short e, and they cared about these things in the sixteenth century. The Wikipedia article also says “The name’s popularity may have been hindered by the tendency to pronounce it /pəˈmiːlə/ pə-MEE-lə which was not fully superseded by the now-standard /ˈpæmələ/ PAM-ə-lə until the start of the 20th century,” but their source for the dating is A World of Baby Names, and I’d like to see a more scholarly source.