The band name is taken from a creature from the folklore of Wales. They are ugly female spirits that are usually described as wearing ash colored clothing with an oblong four-pointed hat, and usually carrying a pot in one hand. They also are known by their disturbing laughter and their cries of "Wow up!" or "Wwb!" . They live in mountainous areas and love to mislead travellers or scare them. However, if a Gwyllion in disguise enters your home and is treated right, they will do no harm. The Gwyllion is repelled by metal knives, and a flash of a knife is usually enough to send a Gwyllion away.