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Crimson-naped woodpecker, crimson-breasted woodpecker or scarlet-breasted woodpecker (Dryobates cathpharius) 

The crimson-naped woodpecker (Dryobates cathpharius) is a species of bird in the family Picidae.
The bird is found in Bhutan, China, India, Myanmar and Nepal.

Piciformes, Picidae: from Latin picus for woodpeckers.

The genus name Dryobates is from the Greek compound word: 'woodland walker'.
The origin is from δρῦς : drus (genitive δρυός : dryós) meaning woodland and -βάτης : -bátēs meaning walker.

The scientific name cathpharius derives from a Latinized form of the Hindi word katphora, meaning "woodpecker". 
This term ultimately shares roots with the Ancient Greek word katapherō, meaning "to strike down" or "drive down":
 + Kata- (κατα-): A preposition and prefix meaning "down" or "against.
 + "Pherein (φέρειν): A verb meaning "to carry" or "to strike."

Dryobates is a genus of birds in the woodpecker family Picidae. The species are widely distributed and occur in both Eurasia and the Americas.

1/ Necklaced woodpecker (Gõ kiến nhỏ ngực đỏ, Dryobates pernyii) 
Once this species was considered conspecific with the crimson-naped woodpecker, crimson-breasted woodpecker or scarlet-breasted woodpecker (Gõ kiến nhỏ ngực đỏ, Dryobates cathpharius)

2/ Crimson-naped woodpecker, crimson-breasted woodpecker or scarlet-breasted woodpecker (Dryobates cathpharius) 

The genus name Dryobates is from the Greek compound word: 'woodland walker'.
The origin is from δρῦς : drus (genitive δρυός : dryós) meaning woodland and -βάτης : -bátēs meaning walker.

Necklaced woodpecker 
(Gõ kiến nhỏ ngực đỏ, Dryobates pernyii) 
Once this species was considered conspecific with the crimson-naped woodpecker, crimson-breasted woodpecker or scarlet-breasted woodpecker (Gõ kiến nhỏ ngực đỏ, Dryobates cathpharius)

The necklaced woodpecker (Dryobates pernyii) is a species of bird in the family Picidae.
The bird is found in Bangladesh, China, Laos, Myanmar, Thailand, and Vietnam.

The genus name Dryobates is from the Greek compound word: 'woodland walker'.
The origin is from δρῦς : drus (genitive δρυός : dryós) meaning woodland and -βάτης : -bátēs meaning walker.