The spelling of "Nicolson" is peculiar because it appears to be different from how it is pronounced. In IPA phonetic transcription, it is written as /nɪkəlsən/. This shows that the "o" in the middle of the word is pronounced as a schwa vowel, which sounds like an "uh" sound. This is why some people may mistakenly spell it as "Nicholson" with an "h." The correct spelling, however, is with an "o" instead of an "h," despite the pronunciation.
The word "Nicolson" is a surname of Scottish origin. It is derived from the personal name "Nicholas", which itself comes from the Greek name "Nikolaos", meaning "victory of the people" or "people's conqueror". The suffix "-son" signifies "son of", thus indicating that "Nicolson" originally denoted "son of Nicholas". Over time, this surname evolved and became common across Scotland and other English-speaking countries.