Pronounced han (falling tone) in "Tang Yun" (Tang Yun). "Shuowen Jiezi" (Shuowen Jiezi) explains it as a dog barking incessantly. The character is from the Dog (quǎn) radical and also indicates pronunciation. The pronunciation is similar to the character "jian" (jian).
Another explanation in "Shuowen Jiezi" (Shuowen Jiezi) is two dogs fighting each other.
Pronounced xian (falling tone) in "Guangyun" (Guangyun) and "Jiyun" (Jiyun), with the same pronunciation as the character "xian" (xian).
Pronounced tian (falling tone) in "Guangyun" (Guangyun) and xian (falling tone) in "Jiyun" (Jiyun), with the same pronunciation as the character "xian" (xian).
Pronounced xian (falling tone) in "Jiyun" (Jiyun). The meaning is the same as previously described.