All I know is German and Sanskrit are close relatives in the Indo-European group of languages. Spanish does not seem to be. But the more I listen to the audio lessons the more it is clear to me that there must be some link somewhere.
Now, what would you say if I say 'tu'. All Hindi speaking people will say that is the informal you (तू). Bingo! A Spanish speaking person would say the same; except they write it as 'tú'. And amazingly the pronunciation is identical - yes with a soft 't'.
Alright, here are a few more:
'pagar' in Spanish is 'to pay'. Guess what it means to Hindi speaking people? To them 'pagar' (पगार) is salary. The pronunciation is identical(=pagaar)
'pero' (=pay-row) in Spanish is similar to पर (=purr) in Hindi (meaning 'but') 'que' (=kay) in Spanish is similar to क्या (=kya) in Hindi (meaning 'what')
Now, this could be coincidence. In any case, I will dig deeper and report soon.