The Japanese pronunciation of this card's name {ホタルクス Hotarukusu) is a portmanteau of the Japanese word for "firefly" (蛍 Hotaru) and the pronunciation of "lux" (ルクス Rukusu).
"Lux" is the Latin word for "light", reflecting this card's LIGHTAttribute and this monster's design, which feature a light bulb in place of its abdomen.