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Apparently "Jerker" is a real Swedish male first name
(hexbear.net)
The names you see on old gravestones are a hoot
"Eufrosyne"
Sadly, in all other germanic languages, j is pronounced like an English y so the jerk part in Jerker is pronounced kinda like the word yell but with a rolled r instead of the double l.
shh, these anglos don't know that