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Fork-tailed drongo-cuckoo (Surniculus dicruroides)

The fork-tailed drongo-cuckoo (Surniculus dicruroides) is a species of cuckoo that resembles the Black drongo (Dicrurus macrocercus).

Surniculus: possibly from French Surnicou: sournois deceitful; Coucou cuckoo. It is also likely a portmanteau of the genus name Surnia (owl) and Cuculus (cuckoo). It can also be interpreted from Latin as a combination of surnos (or sournos) for "deceitful" and cuculus for "cuckoo," referencing the bird's deceptive nature. 
culus: In Latin, "culus" is a vulgar word meaning "buttocks," "posterior," or "anus". The Latin suffix -culus is a diminutive suffix used to mean "little" or "small," similar to the function of suffixes in both Latin and English. 

The suffix "-oides" in dicruroides is from Greek and Latin, as part of the Greek word "-eides" (meaning "like" or "in the form of"), combined with "Dicrurus," a genus name derived from Greek. The genus name Dicrurus itself comes from the Greek words "dikros" (forked) and "oura" (tail).
The name dicruroides literally translates to "like a drongo" or "in the form of a drongo," referring to the fact that the Fork-tailed Drongo-Cuckoo (Surniculus dicruroides) resembles a drongo.

Square-Tailed Drongo-Cuckoo 
(Cu cu đen, Surniculus lugubris) 

The square-tailed drongo-cuckoo (Surniculus lugubris) is a species of cuckoo that resembles a black drongo.

lugubris: mournful, doleful, plaintive, sinister...
culus: ass, arse, anus, 

Surniculus is a small genus of birds in the cuckoo family whose four members are found in tropical Asia and the Philippines. 

1/ Square-tailed drongo-cuckoo (Cu cu đen, Surniculus lugubris) 
2/ Fork-tailed drongo-cuckoo (Surniculus dicruroides)

Surniculus: possibly from French Surnicou: sournois deceitful; Coucou cuckoo. It is also likely a portmanteau of the genus name Surnia (owl) and Cuculus (cuckoo). It can also be interpreted from Latin as a combination of surnos (or sournos) for "deceitful" and cuculus for "cuckoo," referencing the bird's deceptive nature. 
culus: In Latin, "culus" is a vulgar word meaning "buttocks," "posterior," or "anus". The Latin suffix -culus is a diminutive suffix used to mean "little" or "small," similar to the function of suffixes in both Latin and English.