I actually like the names being hidden from the audience. Leaves more the imagination, and generally, I prefer such. However, since no more LBT movies will be created, a little more closure for the names would do wonders.
As per Spikes's mom and dad, I've never seen them, and therefore could not make an assertion of what their names could be. It's quite easy to guess their names based on personality and looks...that's usually how some characters from animations get their names.