How would you pronounce the surname 'Chambliss'? With a long or short 'a'?

I pronounce the following surnames with a long 'a':

Chambers
Chamberlain

But I pronounce Chambliss with a short 'a' like the one in 'and.' I heard a couple of people pronounce Chambliss with a long 'a'--and it sounded odd to my ear. I'm just wondering whether I'm out-of-the-loop with how people generally pronounce this name.