One of my favorite 3rd-party tools to find out if a name is male or female is Gender API.
The free Gender API plan allows for up to 100 lookups per month. Great for those one-off searches! You can also upload an Excel/CSV file and have gender appended.
Here is an example of the quick lookup:
Additional searches are available at a relatively reasonable price. Monthly plans are also available.Let me know what you think!