Found this nice story about a (possible) origin of the name Abucay:
http://www.tambayanet.com/bataan/abucay.html
Of course hard to say whether it really happened this way. At least I verified "kinaykay" to really mean something along the lines of digging, like in the expression "kinaykay ng manok" ("the digging of the chicken") that one can find with Google, and I know that "abo" means "ash" in Tagalog.
Rene
www.AboutNames.ch