You can check out above graph to see how the market cap of NameCoin has changed over time. The market cap value depends on the value of NameCoin on that particular day and number of NameCoin in supply at that day.

How is NameCoin Market Cap calculated?

The NameCoin Market cap is calculated using a simple formula. You can find it below:

NameCoin Market Capitalization in USD = Number of NMC in supply X Price of one NameCoin in USD

Since the price of NameCoin is highly volatile you can see the market cap going up and down a lot. Sometimes price and market cap are not linear to each other due to increase in the supply of coins in the market and stable or decrease in the price of the coin. So you can say that it's not simple to predict the market cap of NameCoin or predict the price of NameCoin.