[Facts] Re: DON'T KNOW WHAT MY NAME MEANS :/
Google has only very few hits for Myunoka, written exactly that way, and it seems among the nearly 2 billion people on Facebook already nobody carries (or at least declares) this as given name.
Thus this looks to me like a coined name, and it might be a good idea to ask your parents, if not yet done, and if possible.
Maybe it's a variation of Myunika, with a possible meaning of "my unique child"?