 In Mongolia and Inner Mongolia, the Mongols also use clan names.The most common category of Mongol names were those of auspicious or (for boys) manly things, such as gold (altan), eternity (Möngke), surplus (hulagu), blue (köke), white (chagha’an), good health (esen), uncle (abaqa), firmness (batu), stability (toqto'a), bulls (buqa, for men), iron (temür), steel (bolad), black (qara), hardness (berke) or nine (yisü).Such names were often combined with suffixes used only for personal names, such as -"dai", -"ge"/"gei", and -"der" for boys and -"jin", -"tani", and -"lun" for girls.