Pinyin:
* Ní kě lā sī: This is the most common system used for romanizing Chinese and would be the most easily recognized by Chinese speakers.
Wade-Giles:
* Ni k'o la ssu: This system is less common but still used by some.
Other options:
* You could choose to translate the name into Chinese based on its meaning. For example, "Nickolas" could be translated as "胜利" (shèng lì), meaning "victory," as it is derived from the Greek word "Nike."
Ultimately, the best way to say "Nickolas" in Chinese depends on your specific needs and preferences.