Where does “फ़रीदाबाद” come from?

फ़रीदाबाद (Hindi) comes from Hindi -आबाद, from Classical Persian ـآباد.

Ancestry of “फ़रीदाबाद”, step by step

Step	Language	Word	Meaning
1	Hindi	-आबाद	placename suffix; city
2	Classical Persian	ـآباد	—

फ़रीदाबाद — Etymology, Origin & Word History | Etymology Explorer