The IUPAC name of CH₃CH₂NHCH₂CH₃ is:
For secondary amines, the larger alkyl group is the parent. Here, it’s ethanamine with an N-ethyl group, named N-ethylethanamine, as per the PDF.
Ref: NCERT Class 12 Chemistry > Chapter 13: Amines > Topic: Chemical Reactions - Carbylamine Reaction and General Reactions