Yahoo Inc. disclosed Monday afternoon that the entity that remains after its merger with Verizon Inc. will be called “Altaba,” and current Chief Executive Marissa Mayer will not be on the board. In a filing with the Securities and Exchange Commission , Yahoo said that the new company — which consists of Yahoo’s remaining investment in Alibaba Group Holding Ltd. and Yahoo Japan, as well as cash and a few other assets — will only need five board members, and Mayer as well as Yahoo cofounder David Filo will not be among them.