[mathgeek]

Not to sound pedantic (I believe this is a very important distinction), but as far as I'm aware most slaves were not _given_ last names by their slavers. They often had (if taken into slavery) or were given (if born in slavery) their own names within their own cultures.

[Pay08]

I'm curious, do native African cultures often have multiple names?

[awesome_dude]

The number of different cultures in Africa, each with its own set of traditions and ceremonies makes that a very difficult question to answer in a generalised way.