The name origin of Shiranui (不知火), a town located on the southern side of the Uto Peninsula facing Yatsushiro Sea (and prone to disastrous tidal surges), has long piqued my interest (image below with Yatsushiro in the background). Seriously: it literally means "Don't Know Fire." But I finally looked it up, and the story is more interesting than I'd thought - it would be better translated as "Mysterious Fire." The cause involves fishing methods and meteorology.
A sea fishing fire (or, in modern times, a really bright lightbulb), used to attract fish during night fishing, is called an "isaribi" (漁火, shown below). The temperature difference between Yatsushiro Sea's wide, warm tidelands and a cool night atmosphere creates a difference in density which acts like a lens, causing the light to diffract in a way that makes the number of lights appear more numerous than the actual, so those observing from shore are, like, "Hey?! What's that light!" - and, hence, 不知火.
I mention this because Kumanich reports that Family Mart's 1,565 Taiwan franchises will begin selling a Kumamon-branded soft ice cream dubbed "不知火." Next time you're in Taiwan, give it a try. - William