Maybe their email is lastfirst@gmail.com, and people occasionally misremember your address and send your correspondence to them. In that case, yes. More likely

Maybe their email is lastfirst@gmail.com, and people occasionally misremember your address and send your correspondence to them. In that case, yes. More likely their email address is firstlastnumber@gmail.com or firstlast@otherprovider.com though, in which cases the types of mistakes people make are likely asymmetric.