As in Erick Pontoppidan, the 18th-century Danish theologian and bishop of Bergen. Pietist. Author of Pontoppidan's Explanation of Luther's Small Catechism (numerous editions from 1737 in Danish, Norwegian and English) and Pontoppidan's Salmebog (1740).
Not exactly a household word.
But Dictionary.com has it (in the entry for another Danish author, Henrik Pontoppidan who won the Nobel Prize for literature in 1917 for his realist novels set in the Danish countryside) as [pon-top-i-dahn]
PDF file of a 21-page study of his catechism by Mogens Brøndsted: "HISTORIEN OM PONTOPPIDANS „FORKLARING" I DANMARK OG NORGE" (Fund og Forskning, Bind 12; 1965) available at http://img.kb.dk/tidsskriftdk/pdf/ffo/ffo_1965_12-PDF/ffo_1965_12_100852.pdf