Reddit reviews Myths and Symbols in Indian Art and Civilization (Princeton Classics)

What was your source? There may have just been a misunderstanding. It wasn't invented in the 19th century. Greek was predominant among scholars back then, so Gammadion was used in English to describe the symbol until the late 19th century when it started being referred to in its Sanskrit transliteration.

You can read about that here. Its a really interesting book.