i need to be able to look up a name that belongs to a number of different
groups, i also need to say to which group/s does this name belong to.

please help

e.g Group A, Group B, Group C
mike bongani Peter
David Nichole Mike
anne Fred Fred
Nichole Mike nani

in this example we have 3 different group names A,B,C. Each group has a list
of names, now i need to find a way to being able to find "Fred" and be able
to say from which group/s does he belong to