Some say that a 32-character random string is a good idea for SSID names:
Treat your WiFi network name as you would a password. Make it complex and avoid using any whole words. Maximum length for an SSID is 32 characters.
I use something like "ASZumFY2J6JeIbpv8xNWVRqmY8SDF8AX" (without quote marks) for my SSID. You can use one of the key generators below to generate your own random SSID. Just trim it back to 32 characters, and you'll have a very strong one.
Others say it can be too unique:
Pick an SSID that is neither very common nor one that is very unique...
There are a number of sites where you can go to look up a SSID and get a location for the network. A prime example is WiGLE.net. If you have a very unique SSID and your network is listed in such a database, this can provide a physical location of your network, which can have a number of negative side effects.
Are these side effects a real concern? The bottom line: how unique should I make my SSID to be a sufficiently strong salt while keeping in mind "side effects" and the nuisance of a user-unfriendly 32-character string?