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 Irish spelling is Ruairí; the Scottish spelling is Ruairidh.
The spelling in Scottish Gaelic is A' Mhòr Bheinn.
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.
The Gaelic phrase "is fearr roe tu Guinness" translates to "you are better off with Guinness" in English.
If that is the correct spelling, it is not Gaelic.
Conehar is not a Gaelic spelling. Is it a surname?
The Scottish Gaelic spelling is Steaphanaidh.
The Scottish Gaelic spelling is Steaphanaidh.
It really doesn't have a Gaelic equivalent.