Hello,
If you are facing problems with name related issues from JOSAA, then you must contact them via their phone number or email provided on their official website.
And if their is difference between names of your son in 10th and 12th certificate or results, then you should clear them out by going or visiting to the school or college and get a new result or certificate with the new and corrected name on it and then you may submit the same to JOSAA.
After this whole process, you can contact the JOSAA committee and give them the same after correction and they would take down their objections.
Hope that helps. Good luck
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