Can any girls or guys sing up to C6 on the piano ( 2 octaves above middle C).?

Any lady who can hit C6 has me outranged by a fifth, and indeed such ladies do exist. As an example from pop music recordings, Deborah Gibson hit C6 in the Bridge of Atlantic 89322 and DM 86744 "Only in My Dreams" and the Patter of 88919 and DM 86427 "Electric Youth" back in the 1980's; if memory serves me correctly, both Mariah Carey and Christina Aguilera can also hit C6. Although I don't have names, the same is true, in spades, of opera soprani and sopranini; the latter can actually pronounce lyrics that high, not an easy task.