You can rename your recordings for easier navigation within the Mevo's library.
In the live edit view, tap the More Options (•••) icon, then open the library.
Navigate to the recording you wish to rename, then tap its More Options (•••) icon. Select Edit Title.
Keep in mind that the file name is saved in the app only. It will not carry over to other devices if you transfer your recordings from the microSD card to another storage device (e.g. a PC).