You have a valid concern. This name variation situation happens a lot.

If you try to NetFile with a name that differs from what CRA have on file
for your SIN, your attempts may be rejected. Don't NetFile until you have this resolved.
Usually you should be able to resolve your name from your previous tax return and your Notice of Assessment. Obtain a copy of your 2013 T1 Return itself (not a summary) and see what was entered. If you are unable to do this, the following are my suggestions;

Do not rely on name variations provided by T slip issuers or on other receipts such as RRSP contribution slips from your bank, or even from other government sources.

- contact CRA by phone in person. Have yor 2013 Notice to hand.
- login to your My Account for CRA if you have one, and check your name
- in the event you get no information, you can try Netfiling with each of your name suggestions,
- file on paper.