Rāmgaṛhīā Sikhs take their name from the 18th-cent. misl leader, Jassā Siṅgh Rāmgaṛhīā. After playing a key role in relieving the besieged Rām Raunī fort near Amritsar, he was appointed its governor. The fort was renamed Rāmgaṛh and from this he took his new title.
"Rāmgaṛhīā." The Concise Oxford Dictionary of World Religions. . Encyclopedia.com. (October 23, 2018). https://www.encyclopedia.com/religion/dictionaries-thesauruses-pictures-and-press-releases/ramgarhia
"Rāmgaṛhīā." The Concise Oxford Dictionary of World Religions. . Retrieved October 23, 2018 from Encyclopedia.com: https://www.encyclopedia.com/religion/dictionaries-thesauruses-pictures-and-press-releases/ramgarhia