This FAQ shows how to rename a stream in your view, and also why streams can have different names for different users (and for administrators how they can rename the stream for everyone)
Renaming a stream
To rename a stream click on the ... in the top right of the screen and select "Rename Stream"
This will bring up the rename dialog - editing the stream title and clicking save will update the name of the stream
Streams for other Users
A stream is a "very personal" way to see filtered Contacts within CANDDi (example: "show me all the people who have been on the pricing page"). If multiple users create their own streams then they can choose their own titles.
Using the same dialog as above - administrators can click "Save for All Users". This will rename the stream for any User who has access to it