From תִּגְלַת פִּלְאֶסֶר (Tiglat Pil’eser), the Hebrew form of Akkadian Tukulti-apil-esharra meaning “my trust is in the son of Esharra”, Esharra being the main temple dedicated to the god Ashur in the city of Ashur. This was the name of three kings of Assyria, including the conqueror Tiglath-Pileser III (8th century BC), who is mentioned in the Old Testament.
People with the name Mar have a deep inner desire to use their abilities in leadership, and to have personal independence. They would rather focus on large, important issues, and delegate the details.