The Z Directory (at vettrasoft.com) has a C-language function, works something like so:
void func()
{
char c = z_guess_sex_byfirstname ("Lon");
switch(c)
{
case 'M': std::cout << "It's a boy!\n"; break;
case 'F': std::cout << "It's a girl!\n"; break;
case 'B': std::cout << "this name is for both sexes\n"; break;
case '?': std::cout << "sex unknown sorry\n"; break;
}
}
it's database driven, the table has something like 10,000+ names I think, but you need to
download and install the z directory (includes many other topo items like countries, geographical landmarks, airports, states, area codes, postal-zip codes, etc along with
c++ functions and objects to access the data). However the names are very English-language
oriented. The table is a work in progress and gradually updated.