thats not entirely true..Most chrisitan names originate in the middle eAst not in Europe. About half of all Malayalee Christian men are named "thomas" which is a middle eastern name. The rest are mostly "john" "George" also middle eastern.
Europeans are using middle eastern names not the other way round. European names of pagan origin like " Siobhan" or " Erin" are not found in india.
We do use Sanskrit names like anand,prakash,arun,prakash,aravind etc and latin/english names like sunny,jimmy etc,Portuguese sounding names like Reynold,Charlie,brittas,Vasco (common among latin/anglo Indians) and Tamil sounding names like Selvaraj,Selvin,Arulraj(common among Nadar Christians)..
Erin is also used..