i do know the MacRitchie/Ritcheys are sept of MacIntosch clan with origins in the mountains, highlands, around LochNess. thank you.
Please be very careful about this sort of thing. There is a lot of arrant nonsense peddled by the Brigadoon industry about surnames, clans and septs. In particular, just because a particular surname is said to be a 'sept of Clan xx' does
not mean that everyone with that surname is descended from Clan xx. Merely that
some people who bore that surname were associated with Clan xx.
G F Black, in his book
Surnames of Scotland, says of Ritchie: "Formerly a common Border surname. From 'Richie', a diminutive of Richard, with intrusive
t. In some instances curtailed from MacRitchie". He quotes early references in Perth, Brechin, Inverness, Glasgow, Aberdeen, and Edinburgh (2). He also quotes two early uses of Richie as a given name, in Stirling and Dunfermline.
Of MacRitchie, he says, "A Highland border name, 'son of Ritchie' .... The Macritchies are really Macintoshes descended from a Richard Macintosh. He quotes early references to the name in Dalmunzie, Glenshee, Clunie and Caputh, all in northern Perthshire.
The only thing you can reliably conclude from your surname is that you had an ancestor whose name was Richard. As described by Black, some (Mac)Ritchies were indeed descended from Clan Chattan (Macintosh) but the name Richard is of Germanic origin and occurs all over Europe (Richard Wagner, various kings Richard of England, Dick Whittington etc etc) and a moment's reflection will make it plain that not every 'son of Richard' is of Scottish, let alone Highland clan origin.
If your ancestor's father was named Cuthbert, I'd say that points to your particular line originating in the Borders.
However I have never heard of the 'Flattops'.