Where does “அனேகமாக” come from?

அனேகமாக (Tamil) comes from Tamil -ஆக, from Tamil ஆக — on the whole, amounting to, in all.

Ancestry of “அனேகமாக”, step by step

Step	Language	Word	Meaning
1	Tamil	-ஆக	forms adverbs and adjectives from nouns
2	Tamil	ஆக	on the whole, amounting to, in all