The word mayday is an internationally recognized distress signal used in aviation and maritime emergencies. It was coined in 1923 by Frederick Stanley Mockford, a senior radio officer at Croydon Airport near London. He was asked to suggest a word that pilots and ground crews could use as a distress signal, one that would be clearly understood even through the static and noise of early radio. Most of the air traffic at Croydon at the time was between England and France, so Mockford suggested m’aider, a contraction of venez m’aider, meaning come help me in French. The word was formally adopted internationally and has been in use ever since.
Daniel and Mom trace the origin of the word, why a French phrase became a universal English-language signal, and what it means that one radio officer’s suggestion in 1923 is still used in every emergency today.

Daniel is nine. He asks the questions, refuses to accept easy answers, and picks every episode topic himself.

Mom does the digging - finding the sources, checking the claims, and translating them into something a nine-year-old will actually sit still for.
Mayday comes from the French phrase m'aider, a contraction of venez m'aider, meaning come help me.
It was coined by radio officer Frederick Mockford at Croydon Airport in 1923.
He chose a French phrase because most air traffic at Croydon at the time was between England and France.
It has nothing to do with the month of May. The similarity is coincidental.
“A hundred years. And now you won't be.”