Europe uses its own naming convention. It's a bit like a hallway becoming a vestibule when you cross the channel :D
Seriously, though, normally Europe would continue with a name that was already in use, but on this occasion I think Met Eireann and DWD named it at the same time, so kept with their own names. I must admit it is confusing, and would help if we all used the same scheme - but that's not in the spirit of brexit ;)