I wouldn't say that Theodora and Caspar etc are eccentric. They're classic, strong names. (I like all except for Imogen)
Rowan Thomas - ok but I've never liked Thomas and Rowan seems so plain. Nice combo though
Lachlan Samuel - I like this one. Lachlan is cute and Samuel is a ncie classic name
Eamon William - I pronounced Eamon like Ee-mon and liked it. Pronounced Ay-mon or AY-a-mon I'm not sure I like it. William is nice but boring. Good middle name though
Bronwen Elinor - really dislike Bronwen but Elinor is lovely and it's a good combo
Aisling Joan - dislike Joan, like Aisling
To be honest I don't think Aisling or Bronwen can measure up to Theodora.