What is the etymology of the words "Sasana" and "Béarla"?

England is called (or spelled) "England" in German, Danish, Swedish and Norwegian England is called (or spelled) "Angleterre" in French, "Inglaterra" in Spanish and Portuguese and "Angliya" in many Slavic languages. Why is "England" called "Sasana" in... show more England is called (or spelled) "England" in German, Danish, Swedish and Norwegian
England is called (or spelled) "Angleterre" in French, "Inglaterra" in Spanish and Portuguese and "Angliya" in many Slavic languages.

Why is "England" called "Sasana" in Irish and "Sasainn" in Scottish Gaelic?
It sounds nothing like "England".

Besides, why in the world is the "English language" called "Béarla(Béarlach) in Irish Gaelic?
It's nowhere near close to "English" or "Sasana(Sasainn)"!!

What is the etymology of the Irish words "Sasana" and "Béarla"?
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