Positive meaning, intelligent and strong, multi-syllablic, potential nicknames, mildly old-fashioned, all boy. Gotcha.
[name]Theodore[/name] ([name]Theo[/name], [name]Ted[/name], [name]Teddy[/name], [name]Bear[/name]): gift of God
[name]Cyrus[/name] ([name]Cy[/name]): throne; sun; lord
[name]Frederick[/name] ([name]Fred[/name], [name]Freddy[/name], [name]Rick[/name], [name]Fritz[/name], Fritzy): peaceful ruler
[name]Julian[/name] or [name]Julius[/name] ([name]Jules[/name], [name]Lee[/name]): youthful
[name]Felix[/name] (Flix, [name]Eli[/name], X, [name]Lucky[/name]): happy, lucky, fortunate
[name]Philip[/name] ([name]Phil[/name], [name]Flip[/name]): lover of horses (but he was also one of the 12 apostles if that improves the meaning)
[name]Colin[/name] ([name]Cole[/name], [name]Olly[/name]): dove, bringer of victory, or cub
[name]Lucian[/name]/[name]Lucius[/name] ([name]Luke[/name], [name]Lucky[/name]): light
[name]Lincoln[/name] ([name]Linc[/name], [name]Lin[/name], Linney): lake settlement (I thought it’s famous bearer might make up for the neutral meaning)
[name]Alistair[/name] ([name]Al[/name], [name]Allie[/name]): defending warrior, defender
[name]August[/name]/[name]Augustus[/name] (Auggie, [name]Gus[/name], Guster): majestic, venerable
[name]Peter[/name]: stone (as in the rock on which God built the church)
Maximilan ([name]Max[/name], [name]Milo[/name], Xim/[name]Sim[/name], M&M): greatest
[name]Alcott[/name] ([name]Al[/name], [name]Allie[/name], [name]Cotton[/name], [name]Ace[/name]): old cottage (not most exciting, but evokes [name]Alcott[/name] the author and her transcendentalist father, etc)
[name]Lysander[/name] ([name]Ly[/name], [name]Sandy[/name], [name]Anders[/name]): liberator
[name]Hope[/name] one of these does the trick, or at least points you in the right direction!