Based on US census data, Bertie is much more commonly used for females. This may not reflect your regional use but this is the broadest dataset that we have (if we had access to world census data we would use this).
On Sat Jul 09 21:13:17 2016, NHORNE wrote:
Show quoted text> $ cat names
> use Text::Names;
>
> print Text::Names::guessGender("Bertie Wooster"), "\n";
> $ perl names
> F