Correct spelling for the English word "Adida" is [ˈadɪdə], [ˈadɪdə], [ˈa_d_ɪ_d_ə] (IPA phonetic alphabet).
The word Adida or Adidas is actually derived from the name of its founder, Adolf Dassler. Adolf Dassler, a German shoe manufacturer, started the company in the early 1920s. He combined the first syllable of his first name, Adi, with the first three letters from his surname, Das, to create the brand name Adidas. It is important to note that the correct pronunciation of Adidas is often debated, with some pronouncing it as Ah-dee-das and others as Ah-dee-dass.