Where does “Hollandaca” come from?

Hollandaca (Turkish) comes from Turkish -çe, from Ottoman Turkish -ce, from Proto-Turkic *-če.

Ancestry of “Hollandaca”, step by step

Step	Language	Word	Meaning
1	Turkish	-çe	like, -like, -ly; -ish; as if, as though; in the...
2	Ottoman Turkish	-ce	—
3	Proto-Turkic	*-če	—

Hollandaca — Etymology, Origin & Word History | Etymology Explorer