yes you can, on the PC you change your steam name to what you want in black ops (if i can remember correctly this all can be done in-game).
you can also give yourself a clan tag which can only be 4 characters long.
The full player name should show up like [----] <Steam Name Here>
(---- meaning whatever your clan tag is)
Treyarch made Black Ops for activision
kill_struck
"Dead Ops Arcade"
Call of Duty Black Ops
his name is Frank Delegulai
joe
Black ops
There are only 4 DLCs or Map Packs for Call of Duty Black Ops
Joseph is his first name.
crash course
Abracadavre by Elena Siegman
death charge