Chrissie,

Yes Nephthys is pronounced the way it is spelled (the 'ph' taken on as the 'f' sound) however this is the Greek name that was given to this Goddess. Her real Ancient Egyptian name was Nb-ht and commonly pronounced as Neb-het.

Since there were no real heiroglyphic vowels in the Ancient Egyptian written language, it is commonplace to insert vowels between the consonants when translating Hieroglyphs, similar to the way you might see an abbreviated add in the classified section of the news paper. (ex: apt. for rnt, ht and ht wtr incld.). Because the true Ancient Egyptian spoken language is basically a dead language, a lot of the pronunciations of Ancient Egyptian words are guesses, however, some may argue that many Coptic and Arabic words, pronunciations, and meanings are very similar to the Ancient Egyptian language.

Interesting!

Two ancient Egyptian dogs are mentioned here:
Their names are Neb and Abuwtiyuw (don't have the slightest clue how to pronounce this one...)