Pronouncing asterisk as asterix /æstərɪks/ is called metathesis.
Some common examples of this phenomenon that I have heard are ask -> aks and introduce -> interduce /ɪntərˈdjuːs/.
So this phenomenon has a fancy name. But is it correct to say asterisk as asterix? How does one decide whether it's metathesis or just a mispronounced word?
See also "religious tenants" - drives me mad, that one.
– Christi Jun 03 '11 at 15:36