Thank you Chris Hampson. I am very intrigued by your answer because, having looked up the word, "Guet" I find that it can refer to 'the watch' that seafarers keep at night. My mother used to say, "my people were seafarers", which offers credibility to your answer. Mind you, there were probably many in Mauritius who termed themselves 'seafarer'.
Thank you also for the link to the Mauritian Genealogy Association. I shall get onto that.