Even if every one of your photos has a uniquely identifiable name, that's only the beginning of organizing them. It's also important to store your images in folders, and folders within those folders, so you can keep track of everything as time goes on.
How exactly you divide your images up will depend on your own needs. For example, some people will be more interested in grouping shots by date, and others by style (eg, portrait versus landscape, or high ISO versus low ISO). There is no 'right' answer here, it's purely about what is going to work for you.