"Variant of Glenda"
The name Glendy is commonly a female name from the "Welsh" origin.
Glendy has the form of Glenda with the final -a replaced by -y, a substitution common in American English girls' names, and it first appears in United States birth records in 1978, well after Glenda's own period of heaviest use. Glenda is a Welsh name built from glan, meaning clean or pure, and da, meaning good, and it came into wide English use in the nineteenth century. On the evidence available, Glendy is best described as a later variant of Glenda rather than an independent traditional name.
Glenda means "From the valley. A feminine form of Glen.".
The pronunciation of Glendy is GLEN-dee.