Gordon Blair - Mystery? or Not!

[Forfarian]

I can't find what the word/name 'AEneas' means or relates to

It's a given name.

See https://www.whatsinaname.net/php/search.php?action=search2&search_name=aeneas

[Forfarian]

"Writers to the Signet," fancy Edinburgh lawyers! have a website & presumably a members list.

The Register of the Society of Writers to Her Majesty's Signet was published in book form in 1983. I have a copy. No Gordon Blair, James Blair or James Gordon Blair is listed in it.

[Forfarian]

I do not see Georgina's maiden name ( that is to say "family name" of BLAIR) on the death index record.
I see her name as the mother --Georgina Lorimer-- (2 given names) BAMBER (family name).

That is because it's an English death certificate. English death certificates don't record the maiden surname of a married woman. Nor do they list even the father of the deceased person, let alone the mother.

[Forfarian]

In the BLAIR to BAMBER marriage both parties were about 17 years old.
In Australia someone would need to give permission for such young people to marry and this would be recorded on the certificate.
Was this not an expectation in the Scotland of the time?

No. Parental consent was not required - this is the reason why Gretna Green became famous as a place to elope to, because it was the first place an eloping couple arrived at after crossing the Border, and they could get married there without it.