Respected Sir/ Madam,
I would like to inform you that I am________ (name) and I am a student of _______ (department) of your reputed college. My roll number is __________ (roll number).
I write this email with the utmost respect to inform you that my name is entered incorrectly in your records. The name entered is ___________ (incorrect name) but whereas my name is ___________ (name). I have even attached the identity proof along with this email for your kind reference.
This is to request you kindly correct the name at the earliest in order to prevent any confusion in the future. I shall be highly obliged for your kind support.
_______ (your name),
_______ (roll number)