I vote [name_u]Evan[/name_u]! [name_m]Clark[/name_m] goes well with [name_u]Dean[/name_u], but I think they’re too matchy. People who hold faculty positions are also known as deans, and [name_m]Clark[/name_m] means… well, clerk. Where a [name_u]Sawyer[/name_u] and a [name_m]Turner[/name_m] could be siblings because both of those titles are rather archaic, [name_u]Dean[/name_u] and [name_m]Clark[/name_m] are too similar to their titular counterparts to use together.
Stylistically I think [name_m]Clark[/name_m] would go well with [name_u]Dean[/name_u]. My personal favorite is [name_m]Marcus[/name_m] though. [name_u]Dean[/name_u] and [name_m]Marcus[/name_m] are both understated and very handsome names. They fit each other nicely as brothers.
I chose [name_m]Marcus[/name_m], but [name_u]Joey[/name_u] was a close second. As [name_u]Dean[/name_u] ends in a heavy -n sound, I personally wouldn’t use another name that ends in -n.