: $jquery :>
The data displayed here is shipped in the above module, in share/lingua.en.givennames.sqlite, and installed in a shared directory when you install the module. See the FAQ entry Where is the database? for details.
The database structure is documented in the FAQ entry What is the database schema?
The web source for the data is 20000-names.com. The number of names in the database is: <: $name_count :>.