additionally, slavic names have short forms, usually meant for affectionate calls ( – – ; equivalent of johnny, annie, etc.). short forms by themselves can form "reemerging" vocative case (sometimes called neo-vocative); it is used for calling a familiar person, substituting nominative singular by removing last vowel ( – – – – ). for this reason, neo-vocative is not possible for male names that can't produce short forms with a final vowel (including some popular ones: ). likewise, there is a neo-vocative form for close relatives: – – (mother – mommy – mom), – – (father – daddy – dad). when replacing nominative plural (used for always plural nouns), it can be used for collective calls: ("guys, lads") – ("gals") – .