It's called 'Cemetery of the No-Name' because they often didn't really know who those people were - maybe a first name, that's all.
8 seconds sound clip from the Before Sunrise movie soundboard.
You can hear this line at 00:29:36 in the Blu-ray version of the movie.
Quote context
[...]
- I think it left a bigger impression on me at that time than any of the museums we went to.
- I know.
- There was this little old man that talked to us. He was the groundskeeper.
- He explained that most of the people buried here, they'd washed up on the bank of the Danube.
- Around the beginning of the century or so.
- Why were all the bodies washing up?
- I always liked the idea of all those unknown people lost in the world.
- People can invent the best and the worst for you.
- Ah, here she is, I think. Yeah, this is the one I remember the most.
[...]