A shortened form of Yahweh or Jehovah, God's personal name in the Bible. Often appearing as part of Biblical names as "-iah", or "Jeho-" as in Isaiah, Jeremiah, Jehoshua, and Jehosaphat, and Hebrew words like הַלְּלוּיָהּ (“hallelujah”).
How often have the words Infinite Spirit and Jah occurred in a corpus of books? (source: Google Ngram Viewer )