The new index of the author's popularity estimation is represented in the paper. The index is calculated on the basis of Wikipedia encyclopedia analysis (Wikipedia Index - WI). Unlike the conventional existed citation indices, the suggested mark allows to evaluate not only the popularity of the author, as it can be done by means of calculating the general citation number or by the Hirsch index, which is often used to measure the author's research rate. The index gives an opportunity to estimate the author's popularity, his/her influence within the sought-after area "knowledge area" in the Internet - in the Wikipedia. The suggested index is supposed to be calculated in frames of the subject domain, and it, on the one hand, avoids the mistaken computation of the homonyms, and on the other hand - provides the entirety of the subject area. There are proposed algorithms and the technique of the Wikipedia Index calculation through the network encyclopedia sounding, the exemplified calculations of the index for the prominent researchers, and also the methods of the information networks formation - models of the subject domains by the automatic monitoring and networks information reference resources analysis. The considered in the paper notion network corresponds the terms-heads of the Wikipedia articles.