Could have been an MPSIMS or IMHO thread, but I settled on here because I suspect the blanks will be filled (for the most part) with CS type stuff, if there are indeed any replies. 
To get the obvious one out of the way: TWAIN
TRAIL. Mark Trail, a Sunday Comics strip from the 1950s, who was an outdoorsman introducing us all, way back then, to Ecology and Nature…
http://coralreefwatch.noaa.gov/marktrail/MarkTrail_9July2006_1500x1027.gif
Cross (pens)
Twain.
Are Cross pens and Mark Cross luggage the same company?
of Zorro.
from Ark?
Classy!
… my words.
Mark, Matthew, John, Paul, and [del]Ringo[/del] the other gospel guy.
Excellent! I was hoping this one would show up before all was said and done! Main reason I started the thread, in fact.
I can’t tell if you’re serious or sarcastic, but just in case, I meant no offense. It was the first thing that came to mind! My brain works that way… 
y Mark and the Funky Bunch
Actually I was praising the turn of phrase. It did occur to me after I had posted the reply that the Robin Williams thing might sting, but it wasn’t what I had in mind. Thanks for calling that to my attention. 
I also wanted to encourage any MARC references to apply to the concept. As in Antony.
Mark Pierre Vorkosigan
(From the Vorkosiganverse books by Lois McMaster Bujold)
Anybody remember “Dragnet 1968” Closing Credits?
Zuckerberg
Cuban
Harmon
Ruffalo
From sports:
Gastineau
Sanchez
McGuire
Messier
Time
y Ramone