Ohh I think that is a mistake from the passport office at the first place, they should have made Kumar as your last name,ashunandal said:i have only first name and second name not surname. i mean i have "rahul kumar" as first name and surname field is blank on passport but in canada its very imp. to have surname for all documents otherwise they will put your first name as surname blank and leave the first name field . i mean to say they will put ****** rahul kumar on all docs. thats main problem...but im not going to change it now maybe later in canada.
In that case its better to get an advice from an immigration lawyer, to find the best solution