Followed you here
What surprised me is that some of the Scots words I could read straight through as German...
(siccar/sicher - sure, certain, secure)
... those are immediately obvious
Yes, because as I'm sure Eul will tell you, Scots (English) is a dialect of English and therefore germanic, quite distinct from Scots Gaellic, which is Goedelic (Celtic)
We like to insist that Scots is a language, a sister - not a dialect - of English.
It was the language of the Scottish Court, of law and of some very fine poetry,
especially in the 15th - 16th centuries, until the Union of the Crowns,
when James VI of Scots became (also) James I of England (with Wales and Ireland).
Since then it has, admittedly, become mainly a range of spoken dialects,
but it has been used for some splendid poetry - the Border Ballads, Burns, Macdiarmid, etc. etc.
The Scots language goes back to the Old English (Anglo-Saxon) dialect of the Anglian Kingdom of Northumbria,
which ruled from the Forth down to the Humber, and west to the Irish Sea, from the 7th - 9th cts,
and, much weakened by the Vikings, still ruled from the Forth to the Tyne until the 11th ct.
But Scots was much influenced by settlers from eastern England
who came as merchants and craftsmen to the new burghs, and also as retainers of Norman nobles, especially in the 12th ct.
Their language was essentially Anglo-Scandinavian, with lots of Norse words brought by the Vikings.
We also had strong links with Scandinavia, the Low Countries and northern Germany,
both through trade and serving as mercenaries, at least till the 17th century.
So, yes, the Scots Leid (language) does have more overt 'Germanic' character than southern English,
though it also has a lot of words of French and Latin origin - like English, but not always the same ones.
Scottish Gaelic is indeed a completely different language, Q-Celtic akin to Irish and Manx. At its height,
in the 11th - 12th cts, it was the language of the countryside in much of the Kingdom of the Scots
but Scots was the language of the court and the burghs, and Gaelic gradually retreated to the Highlands and Islands,
giving way in those regions not to Scots but to 'Scottish Standard English' as taught in schools;
Gaelic is still a living language in the Western Isles, and enthusiastic efforts are being made to revive it.