find column variable sharing another column variable (table)

I have two variables where name1 shares name2 in some cases.

unique(name1) is larger than unique(name2)

name1={'ABC';'ABC';'DEF';'GHI';'GHI'};
name2={'XX1';'XX1';'XX1';'XX2';'XX2'};
T=table(name1, name2);

In this example ABC and DEF share XX1.

How can I find the location of the shared cases? In this example would be rows 1, 2, 3

Answer 1

[Ameer Hamza]

name2={'XX1';'XX1';'XX1';'XX2';'XX2'};
groups = findgroups(name2)
ans =
     1
     1
     1
     2
     2