Harting is pretty popular brand of this connector in Europe, as is VEAM. The pinout is often determined by the company that assembles the snake, no matter the numbering scheme on the connector. There are no real standards, though it's pretty common for all three conductors to be grouped together in a triangle shape, like this:
ramtech CPC config
Things are moving towards some kind of informal standard, but if your snake is older, it could be any arrangement.
Whirlwind, Ramtech, and CBI all offer their pinouts on the web, the company that built yours may too. Otherwise, it's going to be the long way.
ps- like RD said, they have different names, depending on who makes them.
Over there, ILME, Phoenix, and Canford all make Harting-compatible connectors.