It was known as
Sexmoán until January 15, 1991. The town's former name in
Spanish was Sexmoán, as was initially transcribed by Spanish friars. In Spanish, the letter used to be pronounced as a
voiceless postalveolar fricative /ʃ/, identical to the digraph "sh" in English. It was derived from the ancient Kapampangan root word
sasmo, which means to meet, according to a 17th-century Kapampangan dictionary.
Sasmuan therefore is synonymous with "
pitagmuan" or "meeting place of the
datus" or "meeting point". It was named "Sasmuan" because it is where the Pampangos meet when they were at war with the Chinese in
Guagua. In 1991, the spelling was unanimously changed into Sasmuan, due to perceived sexual connotations of the former name. ==History==