Gilleandrais MacAlwyn - Are the following brothers or the same person?

Lark Spencer — what are those data bases?

And do they have citations?

The data base may list them, but really, I’m not kidding, no one in Scotland in the 12th century had that name. Really. Indeed, no one in England could have had that name at that time.

I will explain further.

The first recording of the name Armstrong in Scotland is in 1235. It appears in Cumberland in 1223.

Could it have existed before then?

Sure, but there is no evidence of it.

But the real giveaway is the middle name, "Yates."

Middle names did not exist at this time, and would not for hundreds of years.

Certainly the name "Yates" existed at this time, in England (it means "at the gate"), but had not yet spread to Scotland and Ireland.

So, even in England, the name William Yates Armstrong did not exist in the 12th century.

There's a mistake in the data base.

Unless!

If you've got primary evidence of William Yates Armstrong, then, on a charter, or on some legal document, then yes! It existed.