Rachel - Jean
X-23 - Wolverine
Daken - Wolverine
Young Cable - Cable
Syrin - Banshee
Warpath - Thunderbird
The Cuckos were not originally but were made into Emma’s Legacy characters
Psylocke (Kwannon) - Psylocke (Betsy)
Deadpool family
Sunpyre - Sunfire


Basically newer characters deriving from predecessor’s powers, codename, mythos and/or looks