Literally, in Hebrew : Hand and Name.
Yad also has an archaic meaning which is something like memorial, or, say, dolmen - not a statue or plaque, but rather a comemmorative feature which is organic to the landscape.
The meaning of the name for this particular holocaust museum is that far from concentrating only on the horrors of the Shoa, but is also a memorial to the people who died in it and those who showed great bravery in helping them. The information center in the museum strives to record the name of every person lost - hence the Shem aspect.