If we're only talking the name and Saki is still the guy, then...it's just a nickname, so I suppose he doesn't necessarily have to use it, or just leave it to a nickname that is known but not used much. Oroku "The Shredder" Saki kind of thing.
Like, say, it's a nickname he'd come by back in Japan and it is mentioned to only "loosely translate" as The Shredder, but he doesn't really care to use or be called by the less accurate English translation. (Heck, maybe he never really used it himself, he was only called that by a particular circle.)
Or... alternately, turn it into a nickname the Turtles came up with as a joke; is heard, by only on occasion.
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