No, that's absolutely not true.
Even before Doctor Strange came out, this was unlikely to be true. See, for example, Thaddeus's excellent response to the same question on our sister site (with a lot of information pulled from the comics source material).
The big problem with the theory is that it requires you to start by assuming it's true, then work backward to pick names that fit. It's already on sketchy ground with the unnamed staff Loki has (why is that 's' and not 'l'? Because there's no 'l' in THANOS), and the orb from Guardians of the Galaxy. People then took this a step further to try and "guess" what 'n' and 'h' would be, and it got kinda silly.
But we now know where the Time Gem is. It's in the Eye of Agamatto. There is no 'e' in THANOS, and the 'a' is already covered by the Aether. There's no reasonable way to fit the Eye of Agamotto into this theory.
It was just a coincidence.