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.
After that, the English language just evolved into the language it is today. During different periods in its history, it has added new words - some in exposure to different cultures, some because of new inventions or trade goods, and some because their colonies in far-off lands were also speaking English.