There are many promising tools that helps with bootstrapping tmux sessions, but this simple function, originally shared by Chris Toomey from thoughtbot, beat them all :)

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function tn() {

    if [ -z "$1" ]; then;
        session_name=$(basename `pwd`)
    else
        session_name=$1
    fi

    tmux new-session -s $session_name -n 'main'
}

Once added to ~/.zshrc or ~/.bashrc, etc., you can start new tmux session as simply as typing the following:

> tn

And it will take the name of current directory.

Enjoy!