In Scottish Gaelic 'Eòin" is considered to be the equivalent of 'Jonathan'; Irish has 'Seanchán' which is close in sound. Both of these are 'equivalents' rather than 'translations', however.
Janjuan is not Gaelic.
It has no meaning in Gaelic; it's not a Gaelic name.
Jon Brion's birth name is Jon Wright Brion.
The name is not in Scottish Gaelic.
Jon Reuning's birth name is Jonathan Reuning.
The word for "name" is ainm in Irish (Gaelic);In (Scots) Gaelic it's also ainm.('Surname' is sloinne in Irish; sloinneadh in Scottish Gaelic.)
Makayla is not a word or name in Gaelic, there is no Gaelic pronounciation.
It is not a Gaelic name and has no meaning in Gaelic. In the Irish language Bible it is spelled Iárad FWIW.
You don't. It is not a Gaelic name.
The Scottish Gaelic name Beathag is anglicized as Beatrice.
'Robert' has no meaning in Gaelic: it is a English name.
The name for "Iceland" in Irish is "an Íoslainn"; The name in Scottish Gaelic: ?