Billi, derived from the Germanic 'Willibald', is a gender-neutral given name of German origin. It is composed of two elements: 'wil' meaning 'will' or 'desire', and 'baldo', which means 'bold'. This name was popularized by St. Willibald, an 8th-century Frankish missionary and martyr, who gave his name to numerous places in Europe. The name Billi has gained recognition as a unisex option, often chosen for its strong and confident sound.
The name Billi has seen a significant rise and fall in popularity over the century, with peaks in the mid-60s and early 70s, and low points in recent years.