A Morkie is always more of one breed or the other; we can’t call it a Yorkie-Eskie since it is pretty much either/or as far as the parents go. If both parents are purebred, you’re probably looking at two different breeds that happen to look remarkably similar (Yorkshire terriers and Maltese, for example).
If there’s some question as to what kind of “mixed breed” this is, you might want to check with your vet – they’ll be able to help you out. But first… let’s learn about why these dogs exist!