Two entries with the name Glessig.

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Glessig

Glesing, Glessic

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The sword wielded by Arthur’s warrior Cyfwlch in Culhwch and Olwen.

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Source
Culhwch and Olwen | Late 11th century

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Glessig

Glesing, Glessic

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In Culhwch, Glessic is also said to be the name of a dog.

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Source
Culhwch and Olwen | Late 11th century

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See also
Glas | The Legend of King Arthur
Gleisyad | The Legend of King Arthur