I have never met anyone called Nerida who pronounces her name Ne-reed-a or Ne-read-a although there may be some out there. It is generally pronounced Ne-rid-a. One issue (I find) is often the accent of the person saying it. Most use the BBC/ABC -rid- (as in get rid of it) for this name.
I have always pronounced it with all vowels in the short form and no emphasis on any syllable. I actually get a bit miffed and correct anyone who pronounces it otherwise. I didn't know until today it should actually be Nereeda.