[Xellanoir]

It seems as though in the case of drumcorps, the lowercase usage is present on pretty much all of his social media pages (his own website, Facebook, Instagram), as well as on images that he uses (like this image and ones on his website). The only place it seems as though he uses the capitalized version is on streaming platforms like Apple Music, Spotify and YouTube.

It seems as though the lowercase version is the more predominant, so I would tend to agree with using that name instead.