Naming the documents that you put into your DEVONthink database can be a science or even an art in itself. Some prefer to use some systematics, other precede the documents with the current date (something I used to do but have long abandoned) , and even others simply try to describe the contents of the file. For most documents, however, a good name is already there: the headline of the captured article. To quickly rename the document, select the headline or whatever text passage you would like to use, right-click or Control-click, and choose ‘Set Title As’ from the contextual menu.
If you’re seldomly browsing your database group by group but mainly use the search function for navigation, you could think about not naming your documents at all but, e.g., simply use the name given to it by the scanner. With the built-in OCR of DEVONthink Pro Office the full text of the document is available for searching anyway so you will find it regardless f its name is ‘BoA funds pay-back June 2008’ or just ‘20080614-141306.pdf’ (especially as you can be sure that you have named all similar letters differently over time).