[name_m]Lowen[/name_m] [name_m]Olsen[/name_m] is perfectly fine to me! Sound-wise there’s plenty of prominent names that have the same ending sounds, and they do just fine. [name_m]Owen[/name_m] [name_m]Wilson[/name_m] comes to mind, although it’s -en & -on, rather than -en & -en.
Some suggestions just in case:
[name_m]Lewis[/name_m]
[name_m]Ewan[/name_m]
[name_m]Rowan[/name_m]
[name_m]Dillon[/name_m]
Jo- names (Joseph, [name_m]Jonah[/name_m])
[name_m]Laurence[/name_m]
[name_m]Logan[/name_m]
[name_m]Edwin[/name_m]
[name_m]Robin[/name_m]