The cricket team I played on years back had 2 Pauls. Both were a similar age, height and build. But one had a double-barrelled surname, so he was known as Paul Two-Dads, and the other Paul was Paul One-Dad. Later they just became known as 2 Dads and 1 Dad.
We have 4 Olivers in a sports club of 50 members, so we have nicknamed them to best differentiate them in coversation:
Tall Oli
Spanish Oli
Fit Oli
Baby* Oli (not ratified yet)