147:
1) Because diqdhuq could be an Elvish word made up by Tolkein for all most people care about it.
2) ditto
3) Somewhere along the line it was decided that a kamatz is somehow more frum.
4) The Yeruchom we name after is not that Yeruchom. Ours is the masculine form of Hoshea’s wife’s (daughter? I forget) name. (OK, I made that one up)
5) Sh’va na can easily become a chirik with the right (wrong) accent.