Searching for right middle

[name_m]Arthur[/name_m] [name_m]Dimitri[/name_m]
[name_m]David[/name_m] [name_u]Oberon[/name_u]
[name_m]Gustav[/name_m] [name_m]Endymion[/name_m]

Thoughts and suggestions are needed. What middle would you pair with [name_m]David[/name_m], [name_m]Arthur[/name_m] and [name_m]Gustav[/name_m]…
Another options are [name_m]Arthur[/name_m] [name_m]David[/name_m], [name_m]Gustav[/name_m] [name_m]Lorenzo[/name_m] and [name_m]Gustav[/name_m] [name_m]Berenger[/name_m]…

Any suggestion would be helpful.

[name_m]How[/name_m] about?
[name_m]Arthur[/name_m] [name_m]Phineas[/name_m] or [name_m]Arthur[/name_m] [name_m]Damian[/name_m]
[name_m]Gustav[/name_m] [name_m]Pascal[/name_m] or [name_m]Gustav[/name_m] [name_m]Miguel[/name_m]
[name_m]David[/name_m] [name_m]Malachy[/name_m] or [name_m]David[/name_m] [name_m]Bruno[/name_m]

These lists might suit you!

I like [name_m]Gustav[/name_m] [name_m]Berenger[/name_m].

Some other possiblities:

[name_m]Arthur[/name_m] [name_m]Cosmo[/name_m]
[name_m]Arthur[/name_m] Perregrine (or Pendragon)
[name_m]Arthur[/name_m] Tibault
[name_m]Arthur[/name_m] [name_u]Valentine[/name_u]
[name_m]Arthur[/name_m] [name_m]Inigo[/name_m]

[name_m]David[/name_m] [name_m]Lysander[/name_m]
[name_m]David[/name_m] [name_m]Cornelius[/name_m]
[name_m]David[/name_m] [name_m]Bartholomew[/name_m]
[name_m]David[/name_m] [name_u]Willoughby[/name_u]
[name_m]David[/name_m] [name_m]Gilbert[/name_m]

[name_m]Gustav[/name_m] [name_m]Apollo[/name_m]
[name_m]Gustav[/name_m] [name_m]Amaury[/name_m]
[name_m]Gustav[/name_m] [name_m]Nicodemus[/name_m]
[name_m]Gustav[/name_m] [name_m]Bertram[/name_m]
[name_m]Gustav[/name_m] [name_m]Leopold[/name_m]