I actually think you could have some positive associations with the meaning ‘to be silent’ or ‘to be quiet’. A couple scripture verses popped into my mind.
Scripture references
[name_f]Psalm[/name_f] 46:10
“Be still, & know that I am [name_m]God[/name_m]. I will be exalted among the nations, I will be exalted in the earth!”
1 [name_m]Peter[/name_m] 3:4
“but let your adorning be the hidden person of the heart with the imperishable beauty of a gentle & quiet spirit, which in God’s sight is very precious.”
[name_f]Reverie[/name_f], [name_f]Caprice[/name_f], & Sileo feel a little more well balanced as a sibset, to me at least. I would say that Sileo seems to be the most unexpected choice out of the 3, but I still believe he’s usable. [name_f]Love[/name_f] the girl combos! If it we my choice, I would add Sileo [name_m]Wilde[/name_m] [name_m]Hawthorn[/name_m] “to be silent amidst the untamed hawthorns” 
[name_m]Other[/name_m] ideas
Sileo [name_m]Bly[/name_m] Vineyard
Sileo [name_m]Grey[/name_m] Wildwood
Sileo [name_m]Moses[/name_m] [name_m]Finch[/name_m]
Sileo [name_m]Clyde[/name_m] [name_m]Larkspur[/name_m]
Sileo [name_m]Pine[/name_m] [name_m]Enoch[/name_m]
Sileo [name_m]Miran[/name_m] [name_m]Rye[/name_m]
Sileo [name_f]Wren[/name_f] [name_f]Chapel[/name_f]
Sileo [name_m]Jonas[/name_m] [name_m]Gale[/name_m]