Some of the variations:
MCKRENKINE , MCKRENKIN , MCKRINNILL , MCKRINNLE , MCKRIN , McKrankin , McRainkin , McCrenkein , McCrinkin , McCronkin , McRamken , McRankein , McRanken , McRemkin , McRenken , McRenkin , McRinkin , McRainking , McCainkin , McKrakin , McCrankine , McCrankane , McCrankyne , McRamkine , McRankane , McRankene , McRankin , McRankine , McRenkine , McCrintone , McCainkin , McCrakine , McCrindie , McRinking , McRinking , McRinkin ....
I'm sure there are probably many more ways to hear and spell the name.