I may be wrong, but I believe the name Maverick comes from a lawyer named Maverick down around San Antonio. He had some lazy or incompetent cowboys working his cattle and they let the herd scatter all over the country. So when folks would see roaming lost cattle and ask who's they were. The reply was often, "Oh their just Maverick's". The name for any stray, lost or unbranded cattle soon became known as Mavericks.