Monika, you haven't mentioned in which form would you like to have a name correction. If it is Aadhar card, you may have to  visit the Aadhar Enrolment centre. But due to the current lockdown process, everything is put on hold and only emergency services will be continued until April 15th. So you may have to wait. Even RRB process might be postponed. So unfortunately, it might take more than a month.