Kappa Alpha Theta are only able to require anyone to no longer use the word Theta on t-shirts, or stationery or the like. They only have the trade mark registered in 2 classes. Other companies/organisations have the word Theta, and various logo combinations of Theta in other classes.
I 'bing'ed Theta. KATh came up as the 5th entry on the second page - and now I am interested in the Theta Foundation -
A scientific and not-for-profit organisation, promoting mathematical knowledge, based in Romania. www.theta.ro
Swagbucks searching gave me
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Theta Chi fraternity
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Rhythm
Delta Sigma Theta
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Theta Theta alumni chapter of Kappa Sigma
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Kappa Alpha Theta's national website was on page 2.