De Jongh is a Dutch surname meaning "junior". It is a variation of the more common form "de Jong" or "de Jonge". Among people with the surname "de Jongh" and its variation "de Iongh" are:
Andrée de Jongh (1916-2007), Belgian World War II resistance fighterBabs de Jongh, SupermodelClaude de Jongh (1605-1663), Dutch golden age painterDick de Jongh (born 1939), Dutch logicianEmily de Jongh-Elhage (born 1946), Netherlands Antilles politicianGabriel de Jongh (1913-2004), Dutch-born South African painterHendrik de Iongh (1877-1962), Dutch fencerHendrik Pieter de Jongh (born 1970), Dutch football managerIgone de Jongh (born 1979), Dutch ballet dancerJohn de Jongh (born 1957), American territorial administratorJuan de Jongh (born 1988), South African rugby playerJules de Jongh, American voice actressLudolf Leendertsz de Jongh (1616-1679), Dutch golden age painterMandy de Jongh (born 1961/62), Dutch taekwondo practitionerNicholas de Jongh (born 1944), British theater critic and playwrightSteven de Jongh (born 1973), Dutch bicycle racerTheunis Willem de Jongh, South African bank governorTinus de Jongh (1885-1942), Dutch-born South African painter