It depends on the tapu, anonymous. Tapu Bulu might not care, Tapu Fini might find it hilarious, and if you try to name either Tapu Koko or Tapu Lele this, I highly commend you for not dying in the process.
Granted, either way, it may be prudent to avoid mentioning to Alolan locals that you’ve named an island guardian Tapu Butt, but even then, I’m told that it really depends on which local you inform.
The Pokédex According to Bill 