Other than Robinson and Lamotta...

[Kayo]

alot of not very big name fighters fight each other tons of times.
It seems like female boxers all fight each other numerous times as well

[wmute]

thank god they only fought three times.

see it was so boring it seemed like 48 rounds...

[Lazy Liberal]

Henry Armstrong vs Alberto Baby Arizmendi fought 5 times and Arizmendi won 2 of them.

[Lazy Liberal]

Wille pep vs sandy Saddler 4x

[StarshipTrooper]

Ezzard Charles and Archie Moore four times.

Poet

[squealpiggy]

Things have changed to a degree because of the extra titles. Fifty years ago a long-time champion could beat a challenger only for that challenger to work his way back into contention and fight for the title again. Nowadays rematches only happen if there is a big demand for it, it has nothing to do with being champion.

[duffgun]

Kali Meehan beat Colin Wilson 4 times in the 90's and early 00's.

[!!! Beowulf !!!]

Ted 'Kid' Lewis and Jack Britton fought 20 times, back in the day. One of the legendary rivalries in the sport of boxing between two greats.

[squealpiggy]

Wasn't Micky Ward offered a few million to fight Gatti a fourth time?

[The Troll]

about 360 other fighters.