Is the latin credo from same root as greek cardio?

No, the Latin "credo" and the Greek "cardio" are not from the same root.

* "Credo" comes from the Latin verb "credere," meaning "to believe" or "to trust."

* "Cardio" comes from the Greek word "kardia," meaning "heart."

While both words are important in their respective languages, they have completely different origins and meanings.