I have autocompletion on the command line for git branch names, tag names, commit hashes... basically any commits or named commit pointers.

A lot of my working branches start with my username, "dariusk"

Sometimes I get very lazy and type "git checkout da" and then tab for autocomplete and get a list of every commit hash starting with "da"

Some solutions: have a different username. Have a different first name. Type more than two characters before hitting the autocomplete.