Where does “columnista” come from?

columnista (Spanish) comes from Spanish -ista, from Latin -ista, from Ancient Greek -ιστής, from Ancient Greek -τής, from Proto-Hellenic -tās.

columnista (Spanish): columnist

Definitions

Step	Language	Word	Meaning
1	Spanish	-ista	-ista; one who follows a principle. Example:...
2	Latin	-ista	-ist; one who practises or believes
3	Ancient Greek	-ιστής	Alternative form of -τής; -ist
4	Ancient Greek	-τής	Appended to verbs to form agent nouns
5	Proto-Hellenic	-tās	—