In the Spring and Autumn period the Jin state had a powerful Xi clan.
Tips
history
郤 is not used independently in modern Chinese. It serves as a rare surname and as an old variant of 隙 (crack, rift). The 'rift / ill feeling' sense survives in the classical idiom 前郤 (a past grudge).
谷 (valley) on the left is the sound element here; the reading moved from gǔ to xì. A valley is also a kind of cleft, faintly echoing the 'gap / crack' meaning the character shares with 隙.