"The saga of Hromund Greipsson" plot question

OK this might sound like a bit of a weird question to ask, seeing as I usually know quite about Icelandic legendary and heroic sagas even though I’m not an expert yet. Also, bumping up the saga thread feels useless right now (and this is one of the times when I wish there was an option to delete your posts on this forum)

Anyway, in Hromund Greipsson’s saga, the hero is the son of a Danish farmer called Greipir and his wife Gunnlod. As a young man, he serves in King Olaf’s retinue and joins the king and his men on an expedition to the Hebrides and Gaul (or . While he’s there the king’s men round up some cattle and a local farmer tells them there’s a barrow nearby with a berserker’s corpse and a treasure hoard. So Hromund sails to Valland with his friends and they find the barrow. This scene then happens:

How does Thrain know whose son Hromund is? Is the implication that he used second sight (he was a sorceror when he was alive after all) or psychic ability to find out the name “Gunnlod” or that Hromund’s mother’s family has a reputation for being particularly heroic? I’m also thinking if the fact that Gunnlod is a giantess’ name (the daughter of the giant Suttung, who owned the mead of poetry which he got as wergild for his father’s death) has anything to do with that, making the line a veiled insult and a good answer from Thrain to being called “cat-kin”; he basically makes the insult about Hromund rather than him.

Valland

Also, the quoted passage is from this translation.

He knows because he’s murdered 400-something warriors who weren’t. It’s one of those backwards translations where everybody sounds like Yoda, but basically he’s saying that Hromund must be Gunnlød’s son because few men are his equal in combat.

That has to be a good explanation. Thanks.

And sounding like Yoda? “Gunnlod’s son you must be” LOL.