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A similar question reminds me: When giving talks, I often want to refer to the work of Henry Crapo. I have asked several mathematicians, and none of them were sure how to pronounce his last name. Any help?

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Ironic fact: "Pronunciation" is one of the most commonly mispronounced words, since it is often misspelled "Pronounciation" :) – Andrew Critch Nov 6 '09 at 16:51
up vote 23 down vote accepted

Gordon Royle is right, I'm living in La Vacquerie. The reference to GWU is not correct: that is the workplace of my colleague Bill Schmitt. The US pronunciation is indeed "cray-poe", but in France it tends to become "crah-poe". Henry

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Thanks, and welcome to Math Overflow! – David Speyer Sep 16 '15 at 20:53
Henry omits to mention that in French "crah-poe" is a homonym for "crapaud" (or toad), and so his house is a trove of frog-related humour - – Gordon Royle Sep 17 '15 at 10:28

My name is Martin Crapo, and have always pronounced it Cray-poe. The name evolved from Crapaud and Crepeaux. Pierre Crapo was the French boy who stowed away on his brothers French Merchant ship in the late 1600's. His brother initially refused to bring him on his trip to America from France, so young Pierre boarded the ship unbeknownst to his brother and hid. After a few days, he came out from hiding. Seeing a dilemma, his brother took him along. Arriving in Cape Cod, the ship was caught in a storm and was wrecked upon the rocks. Strangely Pierre, his Captain brother and about 3 sailors survived. When his brother earned enough money to return to France, he apprenticed his brother Pierre to someone for work, saying that he would soon return to get him. He never returned. Pierre was the beginning of the Crapo's in America. My contact is

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Maybe you are related to Henry, who for those interested, is alive and well and living in the tiny village of La Vacquerie et Saint Martin de la Castries in the South of France. See for a brief description of our meeting chez Henry in June. – Gordon Royle Nov 4 '13 at 11:29

It seems that the one of the people in Wikipedia, Governor Henry Howland Crapo of Michigan, has exactly the same name as the mathematician Henry Howland Crapo who got a PhD from Rota and eventually moved to France. I conjecture that it is not a coincidence. The latter Crapo is still alive, I think, because he submitted a paper to the arXiv himself in April of this year. So you could ask him how to pronounce his name, and about his genealogy.

The answer to the first will presumably be what Jason Dyer said, Cray'-Poe (as in Seymour Cray and Edgar Allan Poe). It is true that the name is originally a French word, but it is an entirely American name. According to the reference, the first Crapo was a French castaway who was found on Cape Cod in the 17th century. He was nicknamed crapaud (toad) just because he was French.

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Aha, thank you! The last location I had for him was at George Washington University. – David Speyer Nov 6 '09 at 19:56
I didn't know that submitting a paper to the arXiv could save your life! – Harald Hanche-Olsen Nov 6 '09 at 20:25

KRAY-poe. The name is of French origin.

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French origin seems to indicate a different vowel in the first syllable. – Michael Lugo Nov 6 '09 at 16:25
The original French word, crapaud, sounds like "cap-oo", but in the strange way etymology works, the pronunciation for the surname is indeed correct. (Fun side trivia: for a while the Italian and French words for "colonel" were in use, until at some point by impeccable logic English speakers decided to take the Italian spelling and the French pronunciation.) – Jason Dyer Nov 6 '09 at 16:48
It is definitely KRAY-poe. Richard Stanley told me this when I was a grad student. Also, I've heard Crapo give a talk and that is how he was introduced. – Timothy Chow Jun 5 '10 at 0:37

Wikipedia says it's like "halo."

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Hmm, none of the wikipedia examples are the person I want. Still, that's helpful. – David Speyer Nov 6 '09 at 16:12

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