Fonblanque and de Fonblanque are Huguenot names. They may refer to nine members of a prominent English family, descending from Jean de Grenier de Fonblanque, a banker, naturalised as Jean de Grenier Fonblanque, younger son of Abel de Grenier, comte de Fonblanque,^[1] of Tarn et Garonne, Languedoc. The de Greniers of Languedoc form a family of noble gentilshommes verriers, a monopoly said to have been granted by St. Louis on his return from the Crusades, as an indemnification for the loss of their patrimony in that service.^[2][3] However, French sources mention François de Grenier as Jean de Grenier de Fonblanque's father, and title members of this family as sieur (lord of the manor), and not comte (count).^[4]

• John Anthony Fonblanque (1759–1837) Politician
• John Samuel Martin Fonblanque (1787–1865), Commissioner of Bankruptcy
• Thomas de Grenier de Fonblanque (1793–1861), Diplomat, British Consul-General to Serbia
• Albany Fonblanque (1793–1872), English historian
• Edward Barrington de Fonblanque (1821–1895), English historian
• Sir John Pennefather, 1st Baronet (1856–1933) (his middle name being "de Fonblanque", his mother's family name)
• Florence Gertrude de Fonblanque (1864-1949) Suffragist
• Philip de Fonblanque (1885–1940), British Army officer
• Edward Barrington de Fonblanque (British Army officer) (1895–1981), British Army officer