I am also a fellow Hymas with a interest in where the Hymas name comes from. My Great Aunt Margaret Hymas (born East Ham, London E6 1913) was convinced it was a Greek/Turkish name and we had many arguments over the Xmas table that this was rubbish (mainly form her brother my Grandad - Leslie Hymas ((born East Ham, London E6 1911) until she passed away.
Their father was known as Edward 'Ted' Hymas and he married Maude and had my Great Aunt and Grandad. I have a family tree that my Grandad drew for me just before he died, if anyone is interested. From memory one name far far back that married in was Fagg (roman name for baker).
I am currently living in Melbourne Australia, having emigrated from Chelmsford Essex in 1987. Even though I lived in Chelmsford, the Hymas family (my part anyway) were Eastenders for many many years back. My parents broke the tradition and moved my brother and I out of London to grow up in a 'nicer' environment (and then again to move us to Oz -much to my dislike as I was a young teenager settled with my friends but not my hormones. I love it now and have 2 homes lucky me.