First time I went to Aberdeen docks to pick up a load. I went into the office and this huge bloke came out. He must have been 7ft tall, with long blonde hair and a massive shaggy beard. He spoke some strange language that sounded a bit like Norwegian. I thought he must be a viking and he was speaking Norse. Turns out he was local and speaking dorric*, never did understand a word he said.
* = Not sure how that's spelt.
That'd be Doric, not one I speak. Some argument over whether that's a dialect or a language. Mainly found at the top end of the mainland. If he came from up there then ethnically he could indeed have Scandinavian heritage as a fair bit of invading and pillaging took place over the years.
There are dozens of dialects and languages, some of which are indeed related to other languages, such as Scots/lowland Scots which has its origins in English and one of the Germanic languages.
I can grunt passable English, fluent in Shetlandic which is a sort of patois, know a few phrases in Scots Gaelic (enough to get me arrested), and passable German. One of my regrets is that I didn't try harder with languages at school, but the main one was Latin and that didn't seem terribly relevant.
Having been to prep and public school, a result of being unruly and a bit much for my mum while my Dad was away working, I speak with a fairly neutral and sometimes slightly posh English tone. When visiting friends in Glasgow or Edinburgh I occasionally get a bit of minor hostility because of my accent, at which point I break into Shetlandic to remind who the real soft southerners are