
Latin word re comes from Proto-Indo-European *reh₁ís, Proto-Indo-European *(o)reyǝ-, and later Proto-Italic *reis (Thing, matter.)
*reh₁ís (Proto-Indo-European)
*(o)reyǝ- (Proto-Indo-European)
*reis (Proto-Italic)
Thing, matter.
re (Latin)
About, regarding, with reference to.