Indeed it is a perfectly fine name since it is in English so it makes it unique from the pov of Japanese audiences
Ninjin doesn't have the same punch to it.
I never liked the name argument cause you got a lady named wave, a lady named after a bird, A dude named after a well known swordsman, A liar named after a fable author, A Jinbezame (whaleshark) guy named Jinbe. A dude that has a number 3 in his name because he was the 3rd born son. You get the idea.