Rudidas would definitely be a worse name. Though I'd be surprised if an Amazon Marketplace knockoff brand is not already using it.

Another brother/brother business rivalry, although not involving founders, was Sears and Montgomery Ward from 1985-1990. In 1985 Bernard Brennan become CEO of Montgomery Ward and in that same year his older brother Edward Brennan become CEO of Sears.

Chicago-based Sears was the largest US retailer at the time, and Chicago-based Montgomery Ward was the 5th largest.

Similar thing with Aldi. Both brothers kept the name, sort of.

https://en.wikipedia.org/wiki/Aldi#Split

all day i diss another sibling

Well, Rudi was an enthusiastic (card-carrying, german, literal) nazi.

The story is that Adi was less of a hardliner, but still a card-carrying member of the nazi party.

https://in.rediff.com/sports/report/adi/20051108.htm