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Hi, I am also in the same boat. My first name in the Canadian passport is empty. I only have last name but to apply OCI I was told to put XXX and now I received the OCI with XXX as first name I hope I won't have any issues while traveling. I heard many have the same issue and they are aware of it.
 
Put it as XXX. You will receive OCI with given name as XXX. Travelled with such OCI no issues
Hi sriram zero , recently I received oci with xxx as first name as BLS told me to use xxx as my Canadian pp first name is blank .. travelling to india now I hope I won't have any issues at Indian immigration pls reply pls reply