In the category "Space" we currently track items of 436 persons. The most popular ones, by number of traded items, are:

Buzz AldrinJohn GlennRichard Truly
Harrison SchmittGuion BlufordVance Brand
Bill DanaRobert CrippenNeil Armstrong
James McDivittPete ConradTom Stafford
Mike MelvillGordon FullertonDave Scott
Ed GibsonJerry CarrJerry Linenger
Jim LovellScott Crossfield 

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