Romac on Family Tree Circles

My great grandmother was Harriet Ross, born circa 1839, probably Richmond Tasmania. I have her death certificate which states her father was Simon Ross, mother unknown.
Simon Ross, b. 1801 St Andrews Edinburgh to Alexander Ross and Eupham/Euphemia Ross was tried on 16 Dec 1822 and transported to Australia arriving in Jan.1824 on the ship Asia. He married Ann Baldock, also a convict on 29.9.1834.In that year Simon received a Conditional Pardon for his crime. Their children included Lucy Ann, George, Mary and Simon all born in Tasmania. I can find no birth cert for Harriet, nor a marriage cert. Ann Baldock was single with one child when she was transported in in 1833 so I have wondered whether Harriet may have been her child but there is nothing anywhere to support this. On the contrary, other research suggests Harriet was Simon and Ann's daughter.On his convict record it states that Simon Ross was "very respectably connected". Certainly the family has a long and respected history in Richmond. I have tried to learn more of Simon's parents but as the name ROSS is so common, it is difficult to ensure that I have found the correct family. Was he related to any of the Earls of Ross? The MUNRO and NEWMORE names appear to be connected with surname ROSS with individuals adopting other surnames, including ROSS. It's all very confusing.Simon Ross died in Richmond, Tasmania on 19 Dec 1881.
From IGI I have the following:
Alexander Ross, b. circa 1768 of St Andrews Edinburgh, Midlothian, Scotland
Wife: Eupham Ross b. circa 1772 as above
Children: George Ross b. 31 Jul 1794 as above
Eupham Ross b. 5 April 1796 as above
Alexander Ross b.6 Dec 1797 as above
Christian Ross. b.30 Sep 1799 as above
Simon Ross. b. 28 Sep 1801 as above
I have quite a lot of info now on Simon's descendants but not his ancestry. I have been researching this family for more than a decade. I am very happy to share the info I have. Can anyone help?