That's the link I had in my OP. They have 4 different pronunciations so I guess it's 'take your pick'.
That link is pronouncing it as though there is an apostrophe before the s, as in Shira (a noun) owns a moose. An old book (1892) I have here lists it as a long i in the pronunciation. It is the earliest version I have seen and the only one other than the website.
