Matang gotra is a Jain term used to refer to the lineage or group associated with Matanga, who is known in Jain tradition as a Yaksha (attendant deity) of Mahavira. In Jain practice, gotra is a way some communities identify ancestral lines and guide exogamous marriages, while in other contexts it also appears as names of Yakshas/Yakshinis connected with Tirthankaras. Matanga is commonly listed as the Yaksha of Mahavira in Jain literature, and the name Matanga also appears in lists of Yakshas associated with other Tirthankaras in some texts. Digambar and Śvetāmbara traditions may have slight variations in names or emphasis, but Matanga as a Yaksha is widely recognized. You can read more about Matanga as a Yaksha here and in related Yaksha lists.