Naming them is just a convenience (figuring out which router is yours gets awkward when there are twenty 'linksys' access points in range), but using a strong password -- at least eight characters, using both upper and lowercase letters and numbers -- is very important. The router botnets I mentioned are taking advantage of the fact that few people change the factory-default password; the botnets automatically spider entire IP address ranges looking for routers which still have the default password set, then install malicious software on them.