Ma'anar ƙamus na "bangaren ranar haifuwa" kyauta ce da aka ba wani a ranar haihuwarsa a matsayin alamar so ko bikin. Abu ne na zahiri ko gogewa wanda aka yi niyya don jin daɗin wanda aka karɓa ya yaba masa a matsayin hanyar tunawa da haihuwarsu da bayyana fatan alheri. Kyautar ranar haifuwa na iya zuwa daga kanana, kyaututtuka na sirri zuwa ƙarin bayani dalla-dalla da tsada, ya danganta da alakar mai bayarwa da wanda aka karɓa da kuma kasafin kuɗin su.