[AndyJWest]

Hum, to return to the original question (or at least, what I think the question was), I suppose the Japanese could name a ship 'arigatō', which seems to mean more or less the same thing as obligado in Spanish(or obrigado in Portuguese) - though why anyone would want to call a ship 'Thank You' I wouldn't like to guess.

Or are you looking for words that mean something in Japanese, and something else in Spanish? You could call it 'San', which is 'three' in Japanese, 'Saint' (as a prefix) in Spanish, 'dream' in Serbo-Croat, 'journal' in Vietnamese, 'meat' in Kuna, etc, etc.