Two entries with the name Gleisyad.
Gleisyad
Gleisad
The sword wielded by Arthur’s warrior Syfwlch in Culhwch and Olwen.
Source
Culhwch and Olwen | Late 11th century
Gleisyad
Gleisad
In Culhwch, Gleisad is also listed as the name of a hound.
Source
Culhwch and Olwen | Late 11th century
See also
Glas | The Legend of King Arthur
Glessig | The Legend of King Arthur