It should not pose any issues ideally. If you have mentioned your Surname, it will be good enough. But when you are going for Counselling and document verification, make sure you get an affidavit done stating that both Mr. Sathish and Mr. TG Sathish belong to the same person. That way there will not be any issues. Now that Karnataka High Court has said that it will not interfere with the conducting of COMEDK and authorities going forward with the exam, along with Aadhar card, take another valid Id proof as well. So that there will be no last minute hassles. But ideally, you will not face any issues with your Father's name.