it was intended to be read as "ichi kyu san", but can also be read as "I-Ku-Sa" as in Kamen Rider IXA or Iku-san.
Easy Rider | Kamen Rider | H. Rider Haggard | Nick Kamen | Dean Kamen | Pale Rider | Michael Kamen | Kamen Rider Decade | Kamen Rider 1 | rider | Neon Rider | Whale Rider | The Black Rider | Rider-Waite tarot deck | Red Rider | Midnight Rider | Kamen Rider W | Kamen Rider × Super Sentai: Super Hero Taisen | Kamen Rider Agito | Kamen Bryag | Jack Kamen | Ghost Rider | Alex Rider | Young rider classification in the Tour de France | Steve Rider | Rider (legislation) | Phantom (Kamen Rider) | Peter Collins (speedway rider) | Kamen Rider ZO | Kamen Rider Kiva: King of the Castle in the Demon World |