[hornokpleas]

There are two schools of thought: pronunciation as per the Catholic church, where the sound has evolved (to "ch") over hundreds of years of Latin being used as a working language, and pronunciation as per the Romans, for whom "c" was pronounced "k" (and "v" was pronounced "w").

Neither is really right or wrong, certainly neither is 'anachronistic'. Latin can be regarded as a classical, dead language, or as an ecclesiastical, priestly language, or as something else.

In practice, different pronunciations are used by people with different educational, cultural and religious backgrounds. In many cases the 'accepted' pronunciation is used to signify 'belonging' to a particular tribe (eg academic archeologists vs theologians educated at seminaries). In Scotland it was a sectarian marker (one of about a million obscure indicators of community allegiance) back in the days when Latin was widely taught in grammar schools.

FWIW, I have only ever heard mathematicians refer to the Russell book with a hard C.