of Beau
Source: Webster's dictionaryNouns borrowed from French ending in -eau, -eu, -au, or -ou sometimes have alternative plurals that retain the French -x: beaux or beaus; bureaux or bureaus; adieux or adieus; fabliaux or fabliaus; choux or chous. Source: Internet
Having several "grown up" sisters, Ruby loves to share her knowledge of beaus with her friends. Source: Internet