Hi Yves,
Yes, it's a Visayan
plamingko and probably one of the oldest shown on this web site. There are a few more pictures in the archives, such as
here. Your question about the name for this style of pommel is a good one as we have not defined its name here before. I seem to recall Zelbone referring to it several years ago as having a colloquial name of "chicken's head." It's a very common pommel used primarily on tools and knives for domestic purposes rather than weapons.
As far as I know, the term
plamingko is used throughout Panay, and perhaps in other areas of the Visayas also. I have not heard these knives called anything else. Perhaps Xasterix can help further as he has studied Visayan blades and their names.
Regards,
Ian.