Siegfried Line was the English name assigned to the line, though it apparently reflects Siegfriedstellung, the German name given to the similar World War I defensive line that was called Hindenburg Line by the Allies.
1938, in the meaning defined above
“Siegfried line.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Siegfried%20line. Accessed 25 Sep. 2023.
Britannica.com: Encyclopedia article about Siegfried line
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