Phonosemantic compound. 亻 represents the meaning and 山 represents the sound. Simplified form of 僊.

Evolution

Seal script

Shuowen (~100 AD)

Clerical script

Eastern Han dynasty (25-220 AD)

Clerical script

Eastern Han dynasty (25-220 AD)

Clerical script

Eastern Han dynasty (25-220 AD)

Regular script

Modern