When looking at Pages 22 (erastil) and page 128 (empyreal lords appendix) there seems to be a slight typo. Erastil's family of other gods is listed in his relationships and its lists his wife's name as Jaidi. However in the appendix the name listed is Jaidz. His daughter (Halcamora) and son (Cernunnos) are listed correctly there however so this leads me to believe that there was a minor typo made when entering his wife's name. Right above Jaidz (Jaidi) is the goddess Irez, which makes me think there was a slight mix-up with the last letter and they put a "z" instead of an "i" at the end of Jaidi's name by accident after typing the previous name.