As ever with Russians, the issues of patronymics and transliterations arise. However, in Tikhon's case (1913 - 2007), there is little argument about the specifics: New Groves includes the patronymic and so does Wikipedia. Last.fm is its usual wayward self, with at least eight possible spelling variants, including one entirely in Cyrillic that nevertheless makes a point of including the patronymic.
Thus, there is little apparent doubt that Tikhon Nikolayevich Khrennikov is the correct spelling of this particular individual, as far as we English speakers are concerned, anyway. [...]