Means “master, lord” in Sanskrit. This is a transcription of both the feminine form ईशा and the masculine form ईश (an epithet of the Hindu god Shiva). It is also the name of one of the Upanishads, which are parts of Hindu scripture.
People with the name Thoma have a deep inner need for quiet, and a desire to understand and analyze the world they live in, and to learn the deeper truths.