There’s a Japanese singer whose name is Thelma (Aoyama). This is her website: https://thelma.jp/ In Japanese, her name is written 青山テルマ (AOYAMA TERUMA)。
This name was borne by Thelma Barlow (born 19 June 1929), an English television actress. She is famous for her roles on the British soap opera "Coronation Street" as Mavis Wilton, a role she held from 1971 to 1997, and the British sitcom "dinnerladies" as Dolly Bellfield from 1998 to 2000.
A famous bearer was American actress Thelma Ritter (February 14, 1902 – February 5, 1969). She was well-known for her supporting roles in films like "All About Eve" (1950), "The Mating Season" (1951), "With a Song in My Heart" (1952), "Pickup on South Street" (1953), "Pillow Talk" (1959), and "Birdman of Alcatraz" (1962), all for which she received Academy Award nominations. She also won a Tony Award for Best Lead Actress in a Musical for "New Girl in Town".
Patricia Nixon was actually born Thelma Catherine Ryan. Her father nicknamed her "Pat" because she was born the day before St. Patrick's day. She eventually changed her name legally to Patricia.