More about brio
The Italian noun brio comes from Spanish brío “energy, determination,” ultimately from Celtic brīgos “strength” (compare Middle Welsh bri “honor, dignity,” Old Irish bríg “strength, power”). Celtic brīgos derives from Proto-Indo-European gwrīgos, a derivative of the very common and complicated Proto-Indo-European root gwer- “heavy,” which has many variations, including gwerə-, gwerəu-, and gwerī-. From gwerə- and its variants, English has “grave, gravid, gravity” from Latin; the prefixes baro- “heavy” and bary- “deep” from Greek; and guru from Sanskrit. From gwrīgos, the same source as Celtic brīgos, Germanic derives krīgaz “fight, strife,” German Krieg “war.” Brio entered English in the 18th century.