Congratulations 
Absolutely love your son’s name very handsome!
[name_f][/name_f]I think you and your DH’s overall naming style has lots of similarities [name_m]Lochlan[/name_m] and [name_m]Luke[/name_m] share a similar L sound and have level of strength behind then maybe
[name_f][/name_f][name_m]Leo[/name_m], [name_m]Linus[/name_m], [name_m]Laszlo[/name_m], [name_m]Lewis[/name_m] + [name_f]Lennon[/name_f] would work as a crossover between the two choices. I also think [name_m]Callum[/name_m] + [name_m]Colton[/name_m] with the similar endings, shared L sound situated in the middle along with the C start other names that could work like [name_m]Calvin[/name_m], [name_m]Calder[/name_m], [name_m]Calloway[/name_m] + [name_m]Callan[/name_m].
Some other ideas that could work…
[name_f][/name_f][name_m]Reuben[/name_m]
[name_f][/name_f][name_m]Rome[/name_m]
[name_f][/name_f][name_m]Roscoe[/name_m]
[name_f][/name_f][name_m]Flynn[/name_m]
[name_f][/name_f][name_m]Finley[/name_m]
[name_f][/name_f][name_m]Zachariah[/name_m]
[name_f][/name_f][name_m]Gideon[/name_m]
[name_f][/name_f][name_m]Oscar[/name_m]
[name_f][/name_f][name_m]Lewis[/name_m]
[name_f][/name_f][name_m]Isaiah[/name_m]
[name_f][/name_f][name_m]Tristan[/name_m]
[name_f][/name_f][name_m]Rafferty[/name_m]
[name_f][/name_f][name_m]Otto[/name_m]
[name_f][/name_f][name_m]Dorian[/name_m]
[name_f][/name_f][name_m]Hugo[/name_m]
[name_f][/name_f][name_m]Arlo[/name_m]
[name_f][/name_f][name_m]Arthur[/name_m]
[name_f][/name_f][name_m]August[/name_m]
[name_f]Hope[/name_f] this helps