Else can be found in English text prior to computer existence. Else can't be found in a German dictionary as a conjunction [1]. The first suggestion in Duden is the name for alder tree in lower German. Second suggestion is a firstname. If a word would come from German, it seems the first step would be to look up in a German dictionary.
While the look up for history of computer language is interesting, the conclusion is completely wrong.
While the look up for history of computer language is interesting, the conclusion is completely wrong.
[1] https://www.duden.de/suchen/dudenonline/Else