Some question about the result of word frequency data

Recently, I have read the section of Date and Times in An Elementary Introduction of Wolfram Language. This section has mentioned a function called WordFrequencyData. I had tried some words to observe the word frequency in time series based. For example, I tried to find the word frequency of “eminem”.

DateListPlot@
WordFrequencyData["eminem","TimeSeries",Language->"English"]

And it gave out the result like this:

Due to the result, it seems like the word “eminem” has more use in the years between 1800~1900.
But after searching on google, “eminem” is a rap singer singer name created after 1900. So I have a question about the accuracy of database about word frequency. What is the resource of word frequency. Or maybe there is a wrong in code that Wolfram language can’t interpret accurately.

LIkely something that crept into Google’s n-gram data base through latin

Via latin:

Or as a mispelling from eminent: