Marked Sundanese Pisau Raut: Galuh-Pajajaran?

[naturalist]

Even though the meaning of raut is not an indication of a weapon, but this knife definitely has a function as a weapon.
Got the knife without complete dress, handle made of water buffalo horn.
The handle itself most likely has different age compared to the blade.

On the back, the darker line is the core (the steel).
A friend said, based on the appearance of the metal and the shape of the blade, most likely it is from Galuh-Pakuan era, i amnot sure precisely.

The other friend said that the marking may be Z - Na (seneu = fire), but i amnot sure which one is correct since it could be Tja/Ca (light).