Approved first names in Denmark, M = Male, F = Female, U = Unisex, source: http://www.familiestyrelsen.dk/samliv/navne/soeginavnelister/godkendtefornavne/advanced/

gender_first_names.csv

script.rb

######################
# not tested!!!!!!!! #
######################
require 'csv'

CSV.foreach("gender_first_names.csv","r:iso-8859-1") do |row|
  name, gender = row
  @gender_first_names[name] = gender
end

def find_gender_from_first_name(first_name)
  # if you want call first_name = clean_email_and_find_first_name_from_it here
  name_we_search_for = firstname.downcase.split("-").map{|n| n.capitalize}.join("-")
  @gender_first_names[name_we_search_for]
end

# if no usable firstname e.g. ithoughtthiswastheemailfield@email.com
def clean_email_and_find_first_name_from_it(email)
  email.split("@").first.match(/^\(?<possible_first_name>w{2,})\./)[:possible_first_name].gsub(/_/,'-')
end

# do a loop...