As it is a brand name, it would be Guinness, so there is no difference than in English.
The family name, however, is Mag Aonghusa.
The spelling in Scottish Gaelic is A' Mhòr Bheinn.
The Irish spelling is Ruairí; the Scottish spelling is Ruairidh.
No Gaelic version.
You don't. Cheyenne is a non-Gaelic, proper name and, as such, has no Gaelic spelling.
calin is not a Gaelic spelling.
The Scottish Gaelic spelling is Eòghan.
If that is the correct spelling, it is not Gaelic.
The Scottish Gaelic spelling is Steaphanaidh.
The Scottish Gaelic spelling is Steaphanaidh.
Conehar is not a Gaelic spelling. Is it a surname?
It really doesn't have a Gaelic equivalent.
The Gaelic phrase "is fearr roe tu Guinness" translates to "you are better off with Guinness" in English.