Once you make a new note, I can't figure out how to rename it. You can rename folders, but not the notes themselves.
iMac, OS X El Capitan (10.11)
Open the new Note and enter the desired name as the first line. That will change it based on my testing.
So what do you do if you don't use the notes for text? I use the Apple Pencil in notes and I have a bunch of notes named New Note. It's becoming unmanageable.
I did a few handwritten notes yesterday and all I could do was be very careful with my handwriting on the first line but it wasn't ideal (because my handwriting isn't). This morning I started a new note, and I know I was doing something up the top, so I must have been pulling down, and it delivered me a title box, great. Went on to the next note and it doesn't work.
So long as you have the Format, New Notes Start With, set to Body then the Name is the first line of the Note and can be changed to anything you like.
Highlight the Folder in the left hand column and edit like always by double clicking.
How to rename a note in the new version of Notes
