You can rename any of your journals in Day One, including the default Journal.
- Click Day One in the file menu
- Choose Preferences
- Click the Journals tab
- Click a journal to highlight
- Click the "i" to the right of the joruanl
- Go to Settings
- Tap Journals
- Tap the journal you wish to rename
- Tap in the name field
- Rename the journal
- Tap Save
- Tap Settings (In the sidebar or three-dots button in the upper-right).
- Tap Journals.
- Tap the journal you wish to rename.
- Tap the journal name at the top of
- Tap the checkmark to save the new name