Nah, just seemingly arbitrary numerical designations that don't really refer to anything beyond a 'design matrix plus $thing' style, like 'F150, F250, F350' Why is the zero there? Why does the 5 stay the same? Ford doesn't have a F50, a F120, F370, etc, so why even use those numbers? Why not F1, F2, F3?
BMW does maintain a more rational naming (numbering?) convention, with X3, 5, Z series, etc... but it's still a little wonky.
From a BWM series matrix:
E87 1 series (2004 - present) includes 116i, 118i, 120i, 130i, 118d, 120d.
^^wat
E90 3 series (2005 - present)
^^Looking good, just '3 series'
E60 5 series (2003 - present)
^^Still solid, just '5 series' (but what happened to 2 and 4 series? got something against even numbers?
E63 6 series (2003 - present)
^^Oh, there they are. '6 series'
E65 7 series (2001 - present)
F01 7 series (2009-up)
^^Uh oh, now we've got two 7-series?
E90 M3 (2007 - present)
^^Okay, so now we're in the M3 series? Is that like performance model for the 3 series? No M1?
E60 M5 (2005 - present)
E63 M6 (2005 - present)
^^Continuing, I assume?
Z4 M Coupe (2006 - present)
^^wat. Is it an M series? a Z series? Or a different thing?
E83 X3 (2003 - present)
E70 X5 (2007 - present)
X6 – (2007 – present)
^^*twitch*
E85 Z4 (2002 - present) Current US versions are 3.0 and 3.5
^^*vomits*