How popular is Gemma? Gemma is a very popular first name for females (#1711 out of 4276, Top 40%) and also a very popular surname for both adults and children (#28049 out of 150436, Top 19%). (2000 U.S. CENSUS)
Chomsky and Gould hypothesize that language may have evolved simply because the physical structure of the brain evolved, or because cognitive structures that were used for things like tool making or rule learning were also good for complex communication.
Language is always changing. We've seen that language changes across space and across social group. Language also varies across time. Generation by generation, pronunciations evolve, new words are borrowed or invented, the meaning of old words drifts, and morphology develops or decays. The rate of change varies, but whether the changes are faster or slower, they build up until the mother tongue becomes arbitrarily distant and different.