* Nikki (日記) means "diary" in Japanese. This might be a cute way to interpret the name, especially if the person is fond of writing or keeping journals.
* "Ni" (二) means "two" and "Ki" (木) means "tree" in Japanese. This combination doesn't form a common word but could be interpreted as "two trees" or something similar.
It's important to note that "Nikki" is likely a foreign name, and its meaning would be associated with its origin (e.g., English, French, etc.).