Ok, so the problem is that you find it stereotyping that he now has a katana instead of a rapier but the fact that his name is Sulu never bothered you as stereotyping?
*shrug*
.
The fictional character Hikaru Sulu was born in San Francisco[8], to Japanese and Filipino parents. He was shown as the USS Enterprise's staff physicist in the pilot episode, "Where No Man Has Gone Before",[9] but served as helmsman throughout the rest of the series, during which he held the rank of lieutenant.[3]
Throughout the series, Sulu is shown having many interests and hobbies, including botany,[10]
fencing,[11] and ancient weaponry[12] (Spock says that he "is at heart a swashbuckler out of the 18th century")
.[13]
The character is promoted to lieutenant commander some time before Star Trek: The Motion Picture, and to full commander by the time of Star Trek II: The Wrath of Khan.[8] During the first five Star Trek movies, he serves as helmsman aboard both the USS Enterprise and USS Enterprise-A.[3] He is promoted to captain and given command of the USS Excelsior three years before the events of Star Trek VI: The Undiscovered Country.[8]
Star Trek Generations[14] introduces Hikaru's daughter, Demora Sulu,[3] whose origins are also depicted in Peter David's non-canon novel The Captain's Daughter
He's an American of Filipino/Japanese ancestry, so the name isn't that stereotypical. However, I wouldn't expect someone from his background to fight with a Katana, anymore than you would expect me to fight with a shillelagh