John, that's great to hear! I got to stay a week in England's Lake District back in June 2019; the most time I've been able to spend in and around the village of Threlkeld. Once I showed my bona fides that this Texan really was a Threlkeld, I became something of a temporary celebrity--or at least a curiosity--at the Horse & Farrier Inn's pub. Never mind that we could hardly understand each other.
To keep this on-topic, the first documented use of the surname Threlkeld dates to 1292 in England. The place-name preceded the surname, and it's a dithematic combining two Old Norse words, þrǽll and kelda. We speculate that the name originated during the period of the Danelaw (886 to 1066). The first known written use of þrǽll/þrǽl in England appeared about 950 AD. Background article at the one-name study here.
Just another example of Nordic/Viking influence. In fact, Old English and the flavor of Old Norse called Old East Norse both stem from the same Germanic linguistic roots and were, to a degree, mutually comprehensible. English today would look far different if we hadn't adopted a multitude of words from Old Norse. Everything from the days named Wednesday, Thursday, and Friday, to verbs like are, cut, get, give, lift, run, want, and even the fact that we have third-person plural pronouns: they, their, and them.