I wouldn’t do it. I’ve known sibs with rhyming names who find it very annoying 
You could[name_f][/name_f] do [name_f]Marley[/name_f] and [name_m]Charles[/name_m] maybe. [name_f]Marley[/name_f] and [name_m]Charleston[/name_m]? He could be called [name_m]Charlie[/name_m] sometimes but it would mean they wouldn’t constantly be [name_f]Marley[/name_f] and [name_m]Charlie[/name_m]?