Funny you mentioned that.
The word "Robot" was invented by a Czech. It was first Introduced in a 1920 hit play, R.U.R., or Rossum’s Universal Robots by Karel Čapek.
It was invented by his brother Josef Čapek. Karel was thinking about using "labor" but Josef offered him "robot".
Josef Čapek was the co-writer of some of their joint works but he was mainly a famous painter. He died in a concentration camp at the very end of the war.
Would it be correct as "Nejsem stroj" instead of "Já Nejsem stroj"?
Why is the Já there?
Czech uses personal pronouns less often than some other languages, including English, French, or German, because pronouns are not required to determine the gender in the sentence. The Czech language uses other means to do that, like endings, prefixes, and other modifications of the verb that is used in the sentence.
Personal pronouns are often used for emphasis
for more information follow this link http://www.locallingo.com/czech/grammar/pronouns.html