What is the Greek word of Youth for Christ?

There isn't a single, official Greek translation of "Youth for Christ." The organization's name would be translated differently depending on the nuance one wants to emphasize. Possible translations include:

* Νεολαία για τον Χριστό (Neolaia gia ton Christo): This is a fairly literal translation, using "Neolaia" (youth) and directly translating the rest.

* Χριστιανική Νεολαία (Christianiki Neolaia): This translates to "Christian Youth," which captures the essence of the organization's purpose.

Therefore, there's no single "correct" Greek word or phrase, but these are likely options depending on context.