In Irish it's "garmhac".
ANOTHER ANSWER
Ua is also Irish Gaelic for Grandson. It's the origin of the Ó on Irish surnames.
In Scottish Gaelic ....
The Scottish Gaelic word for 'grandchild' is ogha.
In Irish it's "garmhac"
In Scottish Gaelic 'grand-daughter' is ban-ogha and 'grandson' is mic-mac.
Banán is a Gaelic personal name derived from ban"white". The "O" comes from Gaelic Ó which literally means "grandson of" but more figuratively "descendent of". So it means that probably somewhere back in your family history there was a guy named Banán, and your name got Anglisized along the way.
Grandchild is ogha.Endearments for grandson are stoban or bìodanandgrand-daughter are bìodag and stobag.
Judge Smails's grandson's name in the movie "Caddyshack" is Spalding Smails.
The Irish Gaelic spelling of the surname O'Reilly is Ó Raghallaigh (descendant/grandson of Raghallach. If it is being used as a forename it would probably be "Riley" as in English.
It means grandson or descendant. O'Brien in Irish Gaelic is Ó Briain (descendant of Brian).
Janjuan is not Gaelic.
Alex doesn't have a grandson.
It has no meaning in Gaelic; it's not a Gaelic name.
Bob.