French form of blue (1), used from c.1890 in names of various French blue cheeses (French fromage bleu) marketed in Britain and U.S.
Online Etymology Dictionary, © 2010 Douglas Harper
Examples from the Web for bleu
At this time there was at the palace a pet dog, known by the name of Bleu.A Cursory History of Swearing
Whatever is not practical, whatever cannot be expressed clearly in black and white, he calls “Bleu.”The English Stage
Special mention need only be made of the jewelled porcelain (Figs. 262 and 263) on a bleu de roi ground.The Ceramic Art
Jennie J. Young
And taking the steel glove from the page, Bleu Boar flung it clanging on the marble floor.
So saying, and bidding his people take good care of Bleu Sanglier's retinue, the Prince left the hall with his daughter.