These things with Fuji are all Japanese. Personally, I think Mount Fuji is regarded as a sacred mountain by the Japanese because it is one of the world-famous peaks, reaching 3776 meters, which is the highest peak in Japan. Because it is the tallest in Japan, and the Japanese have the custom of using place names as names, "Fuji" is a symbol of "the best".
Because Mount Fuji, as a symbol of Japan, has a very lofty and great image in the eyes of the Japanese. Just like talking about cherry blossoms, sumo, karate and sushi, you can think of Japan. Therefore, some brands of Japanese products also like to use the word Fuji.