Regular expression for getting first and last name ignoring middle names

I'm searching a regular expression that could give me the first and last name in a string that is a complete name.

I searched but I didn't find one that fit my needs. For instance:

• Abc Def Ghi Jkl ---> Abc Jkl
• Aéc Def Gài Mkl ---> Aéc Mkl
• Aéc-Def Gài Mkl ---> Aéc-Def Mkl
• Aéc Def Gài-Mkl ---> Aéc Gài-Mkl
• Afd ---> Afd

How can I build a regex to return me what is on the right side when the string is what is on the left?