Dekker

Dekker is a Dutch occupational surname, the exact equivalent of English Thatcher, from dekken, to cover. It named the man who put the covering on a building, and in the Low Countries that covering was reed for most of the centuries in which surnames were forming. Occupational names run right through the European record, the list including Smith, Taylor, Miller, Farmer, Thatcher, Shepherd and Potter, and Dekker sits squarely in it.

The particle de in a Dutch surname means simply 'the', as in de Wit, de Bruyn and de Kock, so De Dekker is the roofer with the article still attached. Because the word described a job and not a bloodline, it fixed on unrelated men in every district that needed a roof covered. There is no founding Dekker and no single line: two Dekker families in neighbouring provinces are no likelier to be related than two called Visser.

Thatching builds a roof from dry vegetation layered so each course sheds water clear of the one beneath, and the Low Countries material was water reed, Phragmites australis, cut from wetland beds. Continental practice differed from the English habit of laying new straw over weathered old: reed is a one coat material, stripped when it fails and replaced rather than built up. It takes four to five acres of well managed reed bed to cover an average house, which tied the Dekker to the water as closely as to the building.

The physics was unforgiving and well understood. The roof is pitched between 45 and 55 degrees so rain and snow run off before they can work inward, and thatch is light, around 34 kilograms per square metre, so the frame beneath can be slighter than a tiled roof demands. All of this belongs to the trade rather than to a lineage: the men on the ladders were mostly not called Dekker, and the Dekkers named further down this page were, with almost no exceptions, not roofers.

Thatch is less flammable than its reputation. It burns slowly, described by people who work with it as burning like a closed book, and most fires begin not in the covering but at the chimney: degraded or badly installed flues, sparks settling on the dry surface around the stack, or flame working through a failed chimney into the semi-charred thatch behind it.

The craftsman's answer is specific: strip the thatch immediately around the chimney to the full depth of the stack and make the stack good, which can be done without touching the rest of the roof. None of that reassured a magistrate looking down a street of timber houses under reed. A fire that began in one roof did not stop at one roof, and that fact rewrote the trade the surname is named for.

Tile making in northern Europe thinned out after Rome and returned in the twelfth century, when clay, slate and stone roofing tile came back into use first on abbeys and royal palaces, then were encouraged inside medieval towns to stop fire spreading. The decisive step for the Low Countries came in the 1500s, when city rulers in Holland required fireproof materials outright. Most houses then were timber under thatch, and fire ran through them.

The order created an industry. Many small roof-tile makers began producing tiles by hand, and the profile they settled on was a variation of the pantile with a subdued S curve like an ocean wave, still known across northern Europe as the Scandinavian, or Scandia, tile. It puts the pan and cover of the older two-piece systems into one piece, covering more roof with fewer joints to leak. Those makers were tilemakers, not Dekkers; but the man who fixed their work to the laths kept the old name, and dekken now meant covering in clay.

The trade crossed the Atlantic with the language. Dutch settlers were the first to import roofing tile to their settlements in what is now the northeastern United States, and by 1650 they had established full-scale production of roofing tiles in the upper Hudson River Valley to supply New Amsterdam. The English left tile behind at Roanoke in 1585, and later at Jamestown and St Mary's; the Dutch built the production.

The reason was the reason at home. Clay tile stayed popular in colonial American cities from the 1700s into the early 1800s for its fire resistance, especially once urban fire codes were written, and in a northern winter the clay mattered more than the look of it: the best of it absorbs under two percent moisture and outlasts a century.

The earliest bearers who can be given a date are Dutch, and they are artists and writers rather than roofers. Jeremias de Dekker (c. 1610-1666) was a Dutch poet, carrying the name with the article still on it. Cornelis Gerrits Dekker (1618-1678) was a landscape painter, Frans Dekker (1684-1751) a painter, and Hendrik Adriaan Christiaan Dekker (1836-1905) a painter and lithographer of a later generation. Nothing in the record makes any of them kin.

Cornelis Dekker (c. 1645-1685) was a Dutch physician and essayist, remembered under an entirely different name: Cornelis Bontekoe. The same trade word had by then fixed as a surname in England, where Thomas Dekker (c. 1572-1632) was a working writer of the same period. English Dekker and Dutch Dekker are one occupation named in two related languages, not one family in two countries.

The best known bearer wrote under a name he invented for himself. Eduard Douwes Dekker (1820-1887) is the Dutch writer known as Multatuli. Maurits Dekker (1896-1962) was a Dutch novelist and playwright, An Dekker (1931-2012) a sculptor, graphic designer and publisher, and Marcel Dekker, born in the 1930s, a Dutch-born American encyclopedia publisher.

The sciences carried it too. Theodorus Dekker (1927-2021) was a Dutch mathematician whose name is fixed to a method that still carries it, Dekker's algorithm. Cees Dekker, born 1959, is a Dutch physicist; Elly Dekker, born 1943, an astrophysicist and museum curator; Sidney Dekker, born 1969, a Dutch-born psychologist and safety scientist. Wisse Dekker (1924-2012) was a Dutch businessman and chief executive of Philips.

In sport the name reads like a roll call of the modern Netherlands: Erik Dekker (b. 1970) and Thomas Dekker (b. 1984), racing cyclists, Inge Dekker (b. 1985), a swimmer, Anouk Dekker (b. 1986), a footballer, and Laura Dekker (b. 1995), a solo sailor. It went out in every direction too, in Mark Dekker (b. 1969), a Zimbabwean cricketer, and Ted Dekker (b. 1962), an American author whose daughter Rachelle Dekker (b. 1986) is a novelist as well. Almost nothing connects them but a Dutch verb meaning to cover.