The following site says:The letter W is pronounced [w] or [v] after a, [v] after i or e and [w] after o or u.
So unfortunately the pronunciation of the "w" in Kawekiu is still up in the air.
The other consonants have the values they normally would in English. I believe that the IPA symbols the site uses has the vowels as usually "a"= "ah", "e" = "eh", "i" = ee, and "u" = "oo" as in "boot".
The apostrophe in Ka'iulani indicates a "glottal stop", meaning that the vowel sounds of the a and i are distinctly separated and do not at all blend into the "eye" sound. http://www.omniglot.com/writing/hawaiian.htm