You can have as many email addresses as you want, I have several.
I have two gmail accounts, one which is used for 'proper' business such as banking, council, government gateway, DVLA etc and is made up of my proper name and has very little spam.
The other gmail address is made up of random letters and numbers and is used for websites that don't need my real personal information or banking details. That gets a bit more spam but not much.
If your spam email goes straight to the spam folder then it is quick and easy to deal with. If it is going in to your Inbox and is a real nuisance you should consider getting another email address.
In the past I have found it useful to block the domain but you need to be careful. It's this part of the email address '@spam.com' All well and good if it is unusual but you can't use it for domains such as gmail.com or gov.uk - you would be blocking important email.
These are some of the domains that I have blocked over the years:
@tgselskapsmat.no @220945.ds.nac.net @hkstar.com @currantbird.com