I looked it up, It has no origin in Hieroglyphs. The strange is that no western dictionary has it, I looked in dictionaries of Werner Vycichl, Crum, Kasser, Westendorf, Cerny and Barc and I did not find it, these dictionaries collected words only from texts. So in dictionaries like Abu Maqar p. 150 and Abd el Nor p. 330, and Magdy Youseff p. 338 you will find the word, and you should know that these dictionaries collected words from - in most- the authors's memory/mind.
Crum mentions (XPWouni) but it means some kind of tree!!!!!
One more note the word is not in Greek dictionary of Liddell and scott (the small one).
So, you can use the word carefully.