Guiomar is both a name and a surname found in France, Spain, Portugal, Brazil and Macao. It originated in the north of France during Medieval times, from the fictional character Guiomar, which is found in the Arthurian legends. This name could derive from uuiu (cf. gwiw) which means worthy in Old Breton and marc'h (cf. marc'h) which means horse in Breton.
Notable people with the name include:
- Giomar Guevara (born 1972), Venezuelan baseball player
- Guiomar Pedruco (born 1974), 1st Winner of Miss Macau, 1996.
- Guiomar Novaes (1895–1979), Brazilian pianist
- Guiomar Madalena de Sá e Vilhena (1705–1789), Portuguese businessperson from Madeira
- Pilar de Valderrama (1889–1979), Spanish poet and playwright, nicknamed Guiomar by poet Antonio Machado
Notable people with the surname include:
- Ana Guiomar (born 1988), Portuguese actress
- Johan Nilsson Guiomar (born 1985), Swedish footballer
- Julien Guiomar (1928–2010), French actor
- Maria Guiomar (1664 – 1728), Siamese cook
- Michel Guiomar (1921–2013), French writer and philosopher