I'm guessing the "Shiranui is a ninja name" thing is a reference to ninja characters with "Shiranui" as their surname, such as Mai Shiranui from Fatal Fury/The King of Fighters, and Genma Shiranui from Naruto.
T-That reasoning is a bit...I have ruminated on this for quite some time now...Ninja?
Eh?
That ninja?
All of a sudden!?W-Why a ninja?The name of ShiranuiWhat are you going to do about shipgir-...SHIRANUINo matter how you consider it, it is descended from ninja.
It's not, it comes from the Shiranui sea.Now!