Mostly Harmless

Her father is Arthur Dent, her mother, unexpectedly to all concerned is Trillian, her godless godfather is Ford Perfect. Through a complicated series of misunderstandings at the naming ceremony she is named at random, or "Random" for short.
When Random sets out across the galaxy to find out the truth about her vanished mother, her journey takes her to an utterly insignificant and little blue-green planet whose only entry in the guide reads, "Mostly harmless...."