The “evil eye” is poorly translated, coming from all cultures around the Mediterranean. It is really “The Eye of God.” and Where the Eye of God is watching, no evil may befall this place. It is a symbol of Protection bringing with it Good Fortune.
The owl was a symbol for Athena, goddess of wisdom and strategy, before the Greeks gave their pantheon human forms. According to myth, an owl sat on Athena's blind side, so that she could see the whole truth. In Ancient Greece, the owl was a symbol of a higher wisdom, and it was also a guardian of the Acropolis.
And there are 3, a sacred trinity. The Trinity is found in every religion and culture from Father/Son/Holy Spirit to Maiden/Mother/Crone to the power of three in the buddhist mala (108 is a multiple of 3) and there are 3 main Hindu Gods: Brahma, Vishnu and Shiva.