No. Not in Nominativus, anyway. And your nickname should be in Nominativus. We sign our names, "John," "Mary," "Vasiliy," etc., not "OF John," "OF Mary," "OF Vasiliy."
My feelings are that you are using new, and, innovated Slavonic manuscripts -- All my manuscripts are Pre-Nikon. I will admit, however, that you may know your innovated Slavonic better then I know Slavonic -- unless I am mistaken altogether.
You are mistaken altogether because you do not seem to understand what CASES are. There are seven cases in Old Church Slavonic (six in modern vernacular Russian). Names and nicknames should be used in the NOMINATIVE case ("вєликий
" - or, even more appropriate if it refers to St. Basil the Great, "Bєликий," with the capital B). Using a nickname in a different case, other than nominative (in your profile, the genetive case is used, "вєлікАГО
") - is simply nonsensical. It's like I am asking a man, "what is your name," and he says, 'belonging to John."