By this time Jejeebhoy had established his reputation as an enterprising merchant possessed of considerable wealth. In 1803, he married his maternal uncle's daughter Avabai (d.1870) and settled in Bombay, where he directed his commercial operations on an extended scale. Around this time, he changed his name from "Jamshed" to "Jamsetjee" to sound similar to names of the Gujarati community. By the age of 40, he had made over two crore rupees, a staggering sum in those days. Further riches came to him from the cotton trade during the Napoleonic Wars. He bought his own fleet of ships. Lord Elphinstone, then Governor of Bombay, said of him, "By strict integrity, by industry and punctuality in all his commercial transactions, he contributed to raise the character of the Bombay merchant in the most distant markets."