code: function(firstName, lang) {
    if (lang && male[firstName] && male[firstName][lang] && female[firstName] && female[firstName][lang]) {
      return 'unisex';
    } else if (lang && male[firstName] && male[firstName][lang]) {
      return 'male';
    } else if (lang && female[firstName] && female[firstName][lang]) {
      return 'female';
    } else if (male[firstName] && female[firstName]) {
      return 'unisex';
    } else if (male[firstName]) {
      return 'male';
    } else if (female[firstName]) {
      return 'female';
    }
    return 'unknown';
  }
docs: Match gender type from the first name