Hello Roy,
I can't remember seeing this name before. Where did you find this one?
For the time being and unless we can come up with a more specific and well-supported local name (or names considering the many languages and ethnic groups involved) for these Sumatran utility blades, I believe the most suitable name to be piso raut (or pisau rotan in modern Indonesian parlor) as this is the only name associated with this Sumatran knife I've come across in an early source (piso raoet in old Dutch-Indo spelling). Will try to post a scan later...
Very similar blade shapes are utilized throughout SE Asia as utility knives, especially for cutting rattan; sometimes the hilt is elongated (e. g. those piso ra(o)ut carried with mandau on Borneo).
Regards,
Kai