Should stream name be unique across different users of Eventstore

EventStoreDB
1

Let’s say I have user1 and user2.
Do they share stream namespace? Or can they each have distinct stream named streamName e.g. like users in RDBMS can have tables with same name.

2

you could just use user1-whatever user2-whatever but I think you are
thinking of separate databases in RDBMS not separate users?