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.
The name is not in Scottish Gaelic.
Jon Brion's birth name is Jon Wright Brion.
Jon Reuning's birth name is Jonathan Reuning.
Makayla is not a word or name in Gaelic, there is no Gaelic pronounciation.
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.)
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: ?
"Matthew' is not a Gaelic name; it's a English name.