How Did Adidas Get Its Name?

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Adolf(Adi) Dassler named Adidas.

At 20, in 1920, he made his first pair of shoes.

Dassler's work was in track and field. In 1928,
athletes at the Olympic Games in Amsterdam
wore his shoes.

His goal was to optimize athletic foot-wear.
He developed a shoe for every sport.
Dassler and his brother owned a sport shoe
company. The name of their store was
Gebruder Dassler OHG. Later, the store's
name was known as Adidas.

Source:
http://wiki.answers.com/Q/Who_founderd_adidas&updated=1&waNoAnsSet=1