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What is the etymology of レントゲン (X-Ray) < From Genki II Lesson 12>?

Is it a borrowed word <外来語> from another language?

Translate suggests using X線 instead of レントゲン, but I'm not sure what the
differences are. (Is レントゲン older?)
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meaning word-choice words etymology
Etymology of レントゲン?
I guess, this word based on name of Wilhelm Conrad Röntgen, german physicist,
who first detect electromagnetic radiation in this (X-ray) range. It's
similliar with russian colloquial word for X-ray detector ー "Рентген"
(pronounce like "ˈrentjən").
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2020-04-07T19:05:19.563
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レントゲン is named after the inventor of the X-ray, Wilhelm Röntgen (ウィルヘルム・レントゲン)
— who named them X-rays, whence the confusion.

A number of words in Japanese medical terminology were adopted from German (a
popular example being カルテ from German _Karte_ ). I guess it would not be
surprising if レントゲン was also imported already as a medical term for X-ray,
from German _Röntgenbild_ ("Röntgen image").
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2020-04-07T19:09:59.870
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Its just the German word for it. German does not use X-Ray, it's
Röntgenstrahlung or just Röntgen for short. You can even use it as a verb.
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2020-04-08T15:56:10.773
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Japanese people sometimes localize loan words keeping only the proper noun and
omitting the common noun.  
Eg:  
Röntgenstrahlung → レントゲン線 → レントゲン  
Baumkuchen → バウムクーヘン → バウム
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