The name honors Walter C. Brown [fr], in recognition of his "numerous contributions to Philippine herpetology and … lifelong commitment to the study of biodiversity in the SW Pacific."

The iris is mottled golden-brown and dark brown, with a bright gold ciliary ring surrounding the pupil.

[2] Platymantis bayani is known from primary- and secondary growth forest on karst substrate at 140 m (460 ft) above sea level.

It is possible that it has a broader distribution, but its range is probably restricted by the presence of relatively undisturbed limestone formations with forest cover.

Forest clearing for shifting agriculture, wood collection for firewood and charcoal production, and commercial illegal logging constitute additional threats.