We follow the common convention of first initial last name @ company.com
Having "tech" or "support"...there are 4 of us techs, and each of us generally work with our own clients, we don't mix much. So doesn't make sense to use a "suppor@" or "tech@" mailbox.....because which freaking one of us receives that? Yeah I could make a public folder in our Exchange server for that...but now who spends the extra time checking that each day? So...direct name works best for us....because we cater to SMB clients and each of us 4 techs focuses on our own specific clients.
We do have some catchall common mailboxes....our office manager girl has her e-mail also accepting "acct" and "accounting" @ mail.
But for other places where you have a bunch of repair techs doing volume at a break/fixit shop....and you have a big sales floor with sales people doing lots of store front retail...yeah having "support@" and "sales@" starts to make more sense. Have a manager of each of those departments check that e-mail and dole it out to the troops.