Thanks, came to the comments for this!
Reading Old English as a Scandinavian is always interesting, because if you squint hard enough, you can easily see how the languages are so deeply related. So many modern Scandinavian words have what seem to be lost cognates in Old English, and I suppose vice versa.
That said, I wish translations into contemporary English went further to preserve the etymology of certain words and the grammatical structure of the poem, even if it would make for a much more awkward text. For example, this text translates "middangeard" as "middle-world", which is correct, but it is cognate with "Midgård", which is the Norse mythological name for Earth. (In Scandinavian translations of J.R.R. Tolkien, "Middle Earth" is translated as "Midgård".) I think this lets us understand more about how writers of Old English understood the world, and how it was connected to the broader mythological landscape in North/Western Europe around this time, how Christian and Pagan belief systems were interacting through language as the region was in the process of christianization.
> I wish translations into contemporary English went further to preserve the etymology of certain words
This is how the Icelandic sagas were translated into English in the nineteenth century. Translators then almost always chose the English cognate of the Old Norse world, even if that English cognate was obsolete or its meaning had changed. Far from helping immerse readers in the medieval world, the effect (at least for modern sensibilities) is offputting and goofy, and in the twentieth century publishers like Penguin replaced those translations by new ones with a very different approach. More judicious use of the Germanic lexicon in English, à la Tolkien, provides a more appealing atmosphere of olden times.
Out of curiosity, what are the other two realms? (I assume it’s two)
English is claimed as being influenced heavily by every nation that conquered England, because of course it was: Latin via the Romans; Anglo-Saxon/Gemanic; then Viking; and, then the Latin/Romance influence again via France/Normandy.
And of course, English develops organically (unlike, say, French), allowing new words to emerge, and for old words to take on new meanings. I love it.
As an Englishman, I always find it interesting that there is this weird defined notion of "Englishness" in language, culture, whatever, when our entire history is one of mashing and remixing ideas over at least 2,000 years, and recent discoveries at Stonehenge push that back potentially by 3,000-5,000 years more.
I particularly like the irony of the far-right going on about English identity on a march in London before going to have a lager and chicken tikka masala before heading home to a bungalow and putting on their pyjamas... :)
I think the Scandinavian roots you talk about trace back to common Germanic roots perhaps, but also the Viking aspect will influence a lot. I think English has been "dipped into" by those roots a few times in history, as has Latin.
On the need to keep the etymology aligned in translation: I think this is a routine challenge of the translator's skill, and why so many people have different views of different translations of the same texts.
The Bible could easily be translated in many different ways, but the "King James" version is considered the standard within the Anglican churches in the UK (and seems to be the common root for US church bibles too), but a more modern translation would be possible, as would one that has a closer etymological meaning to the original sources.
It's all interpretative. If people are building entire belief systems and ways of life (and arguably, laws for society), around a translation, and getting it off in a few places, it's likely we're going to run into the same problems even more when translating Tolkien or an ancient poem...
As someone with native command over Hindi and, unless it's spoken by folks from certain UK countries, English, who also spoke and read Sanskrit quite well during school, I had a period of a few months when I went down the rabbit-hole of wonderful general linguistic history and the interrelation among them. I was shocked beyond imagination to see how we might actually have been more the same than different, if we go back far enough (not even prehistoric 'far enough') in each case (even the languages which are geographically distant currently). But then, of course, civilisation happened.