It is said Chimera Ants made from humans keep some of the characteristics from their human life. Do we have any hint about Meruem's human identity ?
I believe that because his birth was fueled by so many humans it is impossible to say that he was born from any particular one despite clearly having human DNA and features. This is similar to the way Youipi was born from a magical beast. The King, as he explains in his fight with Netero is instead the culmination of his entire species' evolution.