Please enter a Portuguese first name
This tool determines whether a Portuguese (European -- no guarantee about Brazilian names) first name is either male or female.
This way, it should be possible, for instance, for a mass mailing to be sent to a list of names and addresses, using the proper greeting, instead of falling back on the generic "Dear Sir/Madam". Other uses are possible as well.
The tool does not use any sort of names database; instead, it works by rules and exceptions.