What's in a name?

Yesterday - the Beatles song - is one of the best-known and most covered songs of recent years.  It sounds so "right" that you would think it more or less wrote itself, and indeed it seems that the melody did come to Paul McCartney pretty well fully formed in a dream.  But the lyrics were another matter and he and John Lennon spent months trying to come up with the right words,  and while they were at it, they gave it the working title of "Scrambled Eggs".