Sometimes, i heard about "John Doe" or "Jane Doe" in a movie, mostly when there's a person whose identity is still unknown (mostly for dead people, like in CSI or 24). I ran a search on Google and found an entry on Wikipedia. It seems that they have a name also for baby, called "Baby Doe" or "Precious Doe". What's more interesting is that Wikipedia list Informal names for unknown or unspecified persons in various countries/regions and Indonesia has one also, called Si Anu / Fulan. It seems very strange since i have never seen any Indonesian movies use this words (Anu) for people whose identity is still unknown. Mostly people use this word when he/she forgot somebody's name. And the second word is more uncommon than the previous one. I wonder where did they get this information
Have you heard of it?