Where they got "Hell" meaning Hello is a mystery. Because it's wrong. Unless it's some backwater dialect I've never seen.
Following is from Geir T. Zoega's 'Concise Dictionary of Old Icelandic'.
http://norse.ulver.com/dct/zoega/index.htmlheilsa (að), v. to say hail to one, greet one (= biðja e-n heilan vera), with dat.; h. á e-n = h. e-m.
heilsa, f. (1) health; (2) restoration to health (hann var feginn heilsu sinni); (3) salvation.
heil-samligr, a., -samr, a. wholesome, salutary.
heilsan, f. salutation, greeting. And yes, Hitler's scum appropriated symbolism from Viking culture.
And it will probably take Centuries for the stench they put on it to fade away.
As for "Hell" it's an undesirable place where the unrighteous end up both in modern English and Old Norse.
In Old Norse it only has 1 'L' on it.
The difference being that unlike the Heat of the Christian Hell, the Heathen Viking Hel was cold, wet, and one endured hunger and thirst there.