I'm curious why the genus name change never caught on with nurseries or the public. People that have been collecting and growing them for 30 or 50 years with vast experience with them still refer to them as feijoa.
I went to a tasting of feijoa yesterday, tasting about 10 named varieties and another 20 or 30 seedlings in trial. I don't have anything written up yet (need to share notes with others), but some were quite good though many were smaller than I like since crop load was heavy this year. Some pruning methods are going to be experimented with as thinning is not very practical since it's hard to see the fruit until it's pretty large. I noticed a variation on the pronunciation of the word "feijoa" and asked about that. It was originally named for a Brazilian botanist and I've recorded this short audio with the pronunciation:
www.correiafarms.com/Feijoa.amr (plays in Quicktime)
I found some sources, including GRIN that lists Feijoa sellowiana and Acca sellowiana as synonyms.
Feijoa sellowiana information from NPGS/GRIN