In the category "Space" we currently track items of 438 persons. The most popular ones, by number of traded items, are:

Buzz AldrinJohn GlennNeil Armstrong
Guion BlufordJim LovellHarrison Schmitt
Vance BrandRobert CrippenBill Dana
Richard TrulyPete ConradTom Stafford
Alan ShepardDave ScottJames McDivitt
Mike MelvillGordon FullertonJames Lovell
Jerry LinengerJerry Carr 

You can find all people that we're currently tracking items for in the alphabetical index:
A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    R    S    T    V    W    Y    Z