I immediately thought of [name_m]Lachlan[/name_m] [name_m]Marlow[/name_m], as they are both in the category of ‘soft names for boys’ in my mind. Their meanings blend well together 
[name_m]Lachlan[/name_m] [name_m]Daniel[/name_m] - love the flow of this. I don’t know if you are considering Persian names for the middle, if you are [name_m]Daniyal[/name_m] or [name_m]Danial[/name_m] might be lovely too.
Summary
Some other Persian ideas. I am not from this culture so apologies if these are names with any inappropriate or negative associations I don’t know about!
[name_m]Lachlan[/name_m] Delshad - meaning ‘happy heart, cheerful’ 
[name_m]Lachlan[/name_m] Feyz - ‘grace’
[name_m]Lachlan[/name_m] [name_m]Aziz[/name_m] ‘powerful, respected, beloved’
[name_m]Lachlan[/name_m] [name_f]Azar[/name_f] - ‘fire’.
[name_m]Lachlan[/name_m] [name_m]Javed[/name_m] - ‘eternal’.
[name_m]Lachlan[/name_m] [name_m]Karim[/name_m] - ‘generous, noble,’ I think it sounds so dreamy with [name_m]Lochlan[/name_m]!
[name_m]Lachlan[/name_m] [name_m]Omid[/name_m] - ‘hope’.
[name_m]Lochlan[/name_m] [name_m]Roshan[/name_m] - ‘bright, light’.
[name_m]Lachlan[/name_m] [name_m]Saeed[/name_m] - ‘happy, lucky’.
[name_m]Lachlan[/name_m] Soheil - ‘smooth, even, level’ & also the name of a star 
[name_m]Lachlan[/name_m] [name_m]Brodie[/name_m] or [name_m]Brody[/name_m]
[name_m]Lachlan[/name_m] [name_m]Miles[/name_m]
[name_m]Lachlan[/name_m] [name_m]Milo[/name_m]
[name_m]Lachlan[/name_m] [name_m]James[/name_m] (so handsome)
[name_m]Lachlan[/name_m] [name_m]Emrys[/name_m]
[name_m]Lachlan[/name_m] [name_m]Albie[/name_m] or [name_m]Albert[/name_m]
[name_m]Lachlan[/name_m] [name_m]Auley[/name_m] or [name_m]Aulay[/name_m]
[name_m]Lachlan[/name_m] [name_m]Arlo[/name_m]
[name_m]Lachlan[/name_m] [name_m]Ernest[/name_m]
Good luck with your search 