Renaissance style stiletto

[A Senefelder]

The triangular " hollow ground " blade is typical of European small sword blades of the 18th and earlier 19th century.

The blade is on the front not really triagle, a bit hollowed.

Hollow grinding is a technique where the faces of the blade are ground into the hollowed shape you referenced allow the blade weight to be reduced by removing mass whilst the blade is strengthened by the geometry of introducing curves into the sides/faces of the blade making it stiffer. This technique became quite common during the 14th century as plate armour became better and increasingly frequent.

I'd say theres a chance that this is a cut down smallsword blade. This doesn't rule out a complete European origin, converting broken small sword blades into " new " dagger wasn't uncommon in Europe.