Maybe I never heard the term because the people I know had been raised in their respective religions and been believers from birth. Thus they never discussed the born again phenomenon.
Even babtism which occurs at about age 16 or so (old enough to make an informed decision) was always considered more of a confirmation than a rebirth.
Baptism makes one a Church member. To be born again, one must repent of the sin of unbelief and be saved by the grace of God. Baptism comes after salvation.
