"Grays" would have been an apropriate name for the Expos the last couple of years, while they played a number of their "home" games in Puerto Rico instead of Montreal.

(Baseball teams traditionally wear gray uniforms on the road, white at home.)

"Grays" is also an old-time Negro code-word for "white folks." In that sense, it would not be a good name for the ex-Expos, many of whom are black/brown Hispanics.