It is a name of a person in India. "Gireesh" is a common name for many Indians.Some part of India it is been spelled as "Girish" too. It is a
combination of two sanskrit words called "Giri" (means Mountain) and "Ishan" (means God). So the literal meaning of "Gireesh" is god of all mountains. This could be interpreted as "Shiva" ( a
mythological Hindu god who lives in top of Mountains) or
the Mountain of all mountains which is Himalayas.