Bitstream has done it. For their fonts numbers served as codes, though. Numbers also indicate the weight of the font like in Jos Buivenga's Museo.

Univers.

It is something that has long been advised against, but even back in the mid-90s we didn't run into actual problems with '1530 Garamond'. It is possible that there is some piece of software out there that will gag on a number in one of the key font names, but I've not come across it yet.

P22 Johnston has a number in it..

I have just run a quick test with a Mac Postscript Type 1 font using a number in all of the naming fields (relevant to that format) and both Word (2011) and InDesign (CS6) picked it up without any problems. I remember encountering some issues with some of the Bitstream fonts many years ago but can no longer remember exactly what version of the Mac OS I was running or what software threw up the problem, though I suspect that it was Quark Passport 4.11 and that using unconventionally named fonts was the least of the issues encountered.

Guess it won't be a problem then. Thanks all!