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Eurasian or common whimbrel 
(Choắt mỏ cong bé, Numenius phaeopus), also known as the white-rumped whimbrel 
formerly Scolopax phaeopus.

The Eurasian whimbrel (Numenius phaeopus), also known as the white-rumped whimbrel in North America, is a wader in the large family Scolopacidae.

The term Charadriiformes comes from New Latin, combining the Greek word kharadrios ("a bird of river valleys" or "a bird of ravines") and the Latin suffix -formes meaning "forms" or "shaped like". Therefore, Charadriiformes translates to "birds shaped like or resembling the charadrius," which is a type of plover or stone curlew historically found in dry river beds or ravines. 

The bird breeds across much of subarctic Palearctic region and Europe; and winters in  Africa, South Asia and Australasia.

The whimbrel is a passthrough, winter bird commonly sighted at the Xuan Thuy National Park, northern Vietnam.

The word Scolopacidae is New Latin, derived from the genus name Scolopax (Latin for "snipe" or "woodcock") and the common zoological suffix for family names, -idae.

The English name may have been influenced by the Old French corliu, "messenger", from courir , "to run".

Numenius (Νουμήνιος, noumēnios) comes from Greek, meaning "of the new moon" or related to the moon's first phase, derived from neos (new) + mene (moon), referencing the curlew's crescent-shaped bill, though it's also linked to "bird" or used by philosophers like Numenius of Apamea, making it a term with both biological and philosophical roots from Greek to Latin. 

Phaeopus comes from Ancient Greek, combining phaios (φaiós) meaning "dusky, gray, brown" and pous (ποῦς) meaning "foot" meaning "dusky-foot" or "gray-foot," used for the Whimbrel bird (Numenius phaeopus) due to its dull, brownish-gray legs and feet, contrasting its speckled brown body, and it's a Medieval Latin name. 

Far Eastern curlew 
(Choắt mỏ cong hông nâu, Rẽ mỏ cong hông nâu, Numenius madagascariensis)

The Far Eastern Curlew (Numenius madagascariensis, Choắt mỏ cong hông nâu) is a large shorebird in the large family Scolopacidae.

The bird spends its breeding season in northeastern Asia, Siberia to Kamchatka, and Mongolia. Most individuals spend the non-breeding season in coastal Australia; some wintering in Indonesia, Thailand, Philippines and New Zealand...

The term Charadriiformes comes from New Latin, combining the Greek word kharadrios ("a bird of river valleys" or "a bird of ravines") and the Latin suffix -formes meaning "forms" or "shaped like". Therefore, Charadriiformes translates to "birds shaped like or resembling the charadrius," which is a type of plover or stone curlew historically found in dry river beds or ravines. 

The word Scolopacidae is New Latin, derived from the genus name Scolopax (Latin for "snipe" or "woodcock") and the common zoological suffix for family names, -idae.

The English name may have been influenced by the Old French corliu, "messenger", from courir , "to run".

Numenius (Νουμήνιος, noumēnios) comes from Greek, meaning "of the new moon" or related to the moon's first phase, derived from neos (new) + mene (moon), referencing the curlew's crescent-shaped bill, though it's also linked to "bird" or used by philosophers like Numenius of Apamea, making it a term with both biological and philosophical roots from Greek to Latin. 

Madagascariensis is a Latin-derived term meaning "belonging to or from Madagascar," indicating a species' origin from that island: the term is built from "Madagascar" plus the Latin suffix '-ensis' for origin. The term was an error or mistaken for Makassar on Sulawesi, Indonesia. This bird species has never been recorded in Madagascar.

Numenius is a bird genus commonly known as curlews which are characterised by their long, slender, downcurved bills and mottled brown plumage.
The English name may have been influenced by the Old French corliu, "messenger", from courir , "to run".

The genus name Numenius is from Ancient Greek noumenios, a bird mentioned by Hesychius. It is associated with the curlews because it appears to be derived from neos, "new" and mene "moon", referring to the crescent-shaped bill.

1/ Eurasian or common whimbrel (Choắt mỏ cong bé, Numenius phaeopus), also known as the white-rumped whimbrel 
formerly Scolopax phaeopus.
2/ Far Eastern curlew (Choắt mỏ cong hông nâu, Rẽ mỏ cong hông nâu, Numenius madagascariensis)
3/ Eurasian curlew or common curlew (Choắt mỏ cong lớn, Numenius arquata)
 The species name arquata is the Medieval Latin name for this bird, derived from Latin arcuatus, "bow-shaped", referring to the shape of the bill.