- Darvish is also known by the Persian name Farid, meaning "glorious".
- Darvish established a humanitarian fund dedicated to the construction, installment, and maintenance of wells, well pumps, and rainwater storage facilities in developing countries called the "Yu Darvish Water Fund" in February 2007. He has announced plans to contribute to this fund by donating 100,000 yen each time he notches a regular season win. The fund is managed by the Japan Water Forum.
- Darvish is the current spokesmodel for DyDo's D-1 COFFEE canned coffee line, succeeding former teammate Tsuyoshi Shinjo in this role.