Theriault is a French surname commonly found in Canada and the United States. The spelling of Theriault is unusual as it contains several silent letters. Using the IPA phonetic transcription, the pronunciation of Theriault is [teʁjo]. The silent letters are 'h', 'e', and 't'. The letter 'h' is used as a digraph with 'ti' to create the sound 'sh'. The letter 'e' is added for etymological reasons, and the letter 't' is silent due to French pronunciation rules.
The surname "Theriault" is of French origin. It originated in France, and the etymology can be traced back to the Old French word "terrier" or "terre", meaning "land" or "earth". The suffix "-ault" is a common suffix used in French surnames, which typically indicates a person's ancestral connection or origin. Therefore, "Theriault" could be interpreted as someone with a connection to a specific piece of land or territory.