In the Norse saga Of Fjornjot and His Kinsmen, the author claims that the Norwegian royal family descends in part from Thrym: Apparently the giant's son, Bergfinn, got busy with a Norwegian princess during a party. (Source)
Thrym's name means "alarm," "noise," or "din" in Old Icelandic. He's better than a rooster! (Cleasby-Vigfusson Old Icelandic Dictionary, "þrymr")
Thrym gets a new name in a Swedish re-telling of his dastardly deeds known as the Thor Song: there, he's called Trolletrams. Sounds like a Disneyland ride. (Nordisk tidskrift för vetenskap, konst, och industri. Föereningen Norden, 1882. p. 206)
Snorri Sturluson doesn't quote from or mention the poem in which Thrym appears, the Thrymskvitha, in his Poetic Edda—he doesn't even tell Thrym's story. Why the diss, Snorri? (Source).
Apparently, Thrym was quite the digger: he hid Thor's hammer eight miles below the earth's surface. (Source).
The moon of Saturn named after Thrym is no giant: its diameter is only 3.5 miles.