So I recently had some thoughts on etymology and wordplay as it related to D&D's medusas.
The word Gorgon ultimately originates from Greek gorgós, meaning "terrible, fierce, grim". In both Latin and Ancient Greek the word is of the feminine gender. There is no masculine counterpart that I could find, although the male given name Gorgias shares the same root. The word Gorgon may or may not be related to the word gargoyle, but if not then both still developed similar meanings independently: terrifying effigies used to protect sacred places.
Medusa's name seems to derive from Greek medeôn, meaning "guardian, queen". There is no masculine counterpart that I could find, although various modern writers have coined the name "Meduso" using Spanish gender declension. The third party OSR supplement Wyrms & Warlocks: Medusa's Hunger published by Goblinoid Games coins the name "medusan" to refer to a male medusa, a simple compound of medusa plus the suffix -an.
The name "maedar" seems to be a wholly invented word with no discernible etymology. I suspect it probably derived from playing around with the syllables in "medusa" plus the suffix -er, patterned after widower.
In the third party d20 product Book of Templates, a half-medusa template is introduced, reprinting an earlier template written by Sean K. Reynolds. In the book, a half-human/half-medusa specifically is known under the name "padrafyte" and presented as a playable race instead of a template. I can only speculate on the etymology, but it seems to derive from padre ("father, priest") plus -phyte ("growth"). In other words, it means "growth like the father", referring to their resemblance to their non-medusa parent.
