If that is their level of reasoning they would be as scary as liberals.
Isn't that like the wacky "sounds like" theology of Hal Lindsey and Tim LaHaye?
The name Moscow comes from the tribal name Meshech, and Tobolsk, the name of the principal state, comes from Tubal. The noun Gog is from the original tribal name, Magog, which gradually became Rosh, then Rus, and today is know as Russia. In the very interesting book The Late Great Planet Earth, my friend Hal Lindsey presents a lengthy discussion of the identity of these nations. I was so impressed by the accuracy of his sources and his readable style that I obtained permission to quote him at length, with numbered footnotes indicating his sources. (Tim LaHaye, quoted in "But Is It In The Bible?" by Gary DeMar)
The Japanese word is read Sa-mu-rai, whereas the root of the former is Sam-a-ri-a. Completely different etymologies.
The closest I could summise, without justification, would be maybe a foreigner enters Japanese culture, describes his history in his language and the host country attempts to translate the foreign word into their language. Of course, Japan isn't known for receiving foreigners before the last 2 centuries very amicably, let alone in the status of 'Samurai'. This is also confirmed by Japanese history. From http://www.campusprogram.com/reference/en/wikipedia/s/sa/samurai.html#Etymology%20of%20Samurai we read:
The word samurai has its origins in the pre-Heian period Japan when it was pronounced saburai, meaning servant or attendant. It was not until the early modern period, namely the Azuchi-Momoyama period and early Edo period of the late 16th and early 17th centuries that the word saburai became substituted with samurai. However, by then, the meaning had already long before changed.
A different etymologu is provided for Samaria from the same website:
"Samaria (Hebrew Shomron) is a term used for the mountainous Northern part of the West Bank. In modern times, the name "Samaria" is most often used by Zionists. Others prefer to use the collective name "West Bank" rather than "Judea and Samaria".