Microsoft's Java implementation that got them sued was J++. As part of the settlement, they weren't allowed to add any new features to it, and it quietly faded into obscurity, along with its CLR counterpart J#, the latter having finally left even extended support in 2017.

C# was developed independently of J++ and J# (though J# was based on J++ to provide a transition path for J++ developers), and although Anders Hejlsberg (original lead architect of C#) did also work on J++, he also worked on Turbo Pascal and Delphi before coming to Microsoft, and I'd suspect that those influenced C# more (more conceptually than syntactically, of course).

C#'s development was motivated by their relationship with Sun, but J++ was MS's non-conforming Java implementation. They were sued for it, and basically couldn't develop it any further (with regard to maintaining Java compatibility, to the extent that they cared to at least).