What is the best 32bit hash function for short strings (tag names)?

Question

What is the best 32bit hash function for relatively short strings?

Strings are tag names that consist of English letters, numbers, spaces and some additional charact

Answer 1

I'm sorry for the very late reply on this. Earlier this year I composed a page titled Hashing Short Strings which might be helpful in this discussion. In summary, I found that CRC-32 and FNV-1a are superior for hashing short strings. They are efficient and produced widely distributed and collision free hashes in my tests. I was surprised to find that MD5, SHA-1 and SHA-3 produced small numbers of collisions when the output was folded down to 32-bits.