Gucci, Hermes, Armani, Dior. Before they were brands, they were actual surnames of DESIGNERS.

Not too difficult. But why did you misspell Pythagoras? And another minor quibble - the mathematician/scientist label only really covers half of the 'thinkers' group (Newton and Diophantus were mathematicians, Newton also a scientist and natural philosoper, Plato not a scientist nor a mathematician but a philosopher, as was Pythagoras - he was credited with mathematical discoveries but there is little evidence they were actually made by him).

Designers should be an acceptable answer for fashion brands. The mathematician answer i said Theorists which feels like an acceptable answer as well