Hi Detlef, the name for this utility knife (e.g. used for scrapping and cutting rattan, harvesting rice, splitting areca nuts, etc.) is "Outtiwon" in Batad Ifugao.
The "Hinalun" which you showed, come in different sizes, e.g. approximately 5 to over 14 inches in length. Thus, have different uses. Generally, however, it is a weapon; the larger ones sometimes used for cutting wood.
I hope this helps.
Nonoy
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