I have never heard the word from anyone other than followers of Ayn Rand. --LMS
The word appears, but rarely, in the philosophical literature, I think.
Two examples I found on the web:
However, the correct jargon here is 'intrinsic value theory', so I changed it.
Other examples of 'intrinsic value theory', besides the labor theory of value, would include various forms of environmentalism, and at least one theory (not of any repute, I think, but I did read it somewhere) that the 'real' value of any thing is the amount of energy it took to produce it.