The spelling of the word "asmussen" is pronounced as "ahs-muh-suhn". The first syllable "ahs" is pronounced with a short "a" sound, followed by "muh" with a short "u" sound, and then "suhn" with a short "u" sound. The final "en" at the end of the word is not pronounced, so it's easy to misspell it as "assmussen". To spell the word correctly, remember to use a single "s" in the middle, and omit the final "en".
The surname Asmussen is of Danish origin. It is a patronymic surname derived from the personal name Asmus, which itself is a variant spelling of the name Atze or Adso, ultimately from the Old High German name Adalhelm composed of adal meaning noble and helm meaning helmet or protection. The suffix -sen indicates son of, thus making Asmussen mean son of Asmus.