Agent 37

Grayson (2014) #1: Uses this alias to go undercover at Spyral after his death is faked

Dan Smith

Detective Comics (2016) #1050: Uses alias to go undercover at Arkham Tower to check in on Helena Bertinelli

Dick “Crutches” Grayson

Nightwing (1996) #108: Uses this alias while going undercover with the New York mob

Dicky Boy

Nightwing (2016) #70: Uses this alias after his memories are altered by the Joker he believes himself to be the villain’s son

Freddy Loyd

Robin Year One (2000) #4: Uses alias as a child after running away and to go undercover to spy on The Shrike

Fredric Dinardo “Burn”

Gotham Underground (2009) #3: Uses alias to go undercover in Gotham’s underground after Black Mask’s death causes a power vacuum

Renegade

Nightwing (1996) #112: Uses this alias while taking down Lex Lutheor’s team of supervillains and showing Rose Wilson another way of life

Ric Grayson

Nightwing (2016) #50: Uses this alias while experiencing memory loss

Richie Grayson

Trinity (2008) #25: Uses this alias to meet with Andrew Tresser, U.S. Operative

Robert “Robbie” Malone

Nightwing (2016) #116: Uses this alias to evade law enforcement when suspected of Murder due to being framed by Heartless

Talon

Nightwing (2016) #66: Temporary uses this alias after having his memories stolen by The Court of Owls

The Target

Robin: Year One #4

Well, I had noticed before that the name was a combination of his father's second name and his mother's maiden name. But that's not all!

The alias Freddy Loyd is actually a callback to one of the issues from Batman 1940, in which Dick disguises himself as a "second Robin" to trick Bruce (and Alfred), using the name Fred Loyd for this fake identity.

Batman v1 Annual #4

The more I learn about it, the more I appreciate this detail!