Help me think of some good middle names for [name]William[/name]. Last name is [name]Watson[/name] 
Almost everything will sound good! You want a longer name in the middle spot for flow-- 3 syllables. I don’t know what style you’re looking for so here’s a variety:
[name]Abraham[/name]
[name]Adrian[/name]
[name]Alastair[/name]
[name]Alfonso[/name]
[name]Augustus[/name]
[name]Benedict[/name]
[name]Cameron[/name]
[name]Constantine[/name]
[name]Dominic[/name]
[name]Elias[/name]
[name]Elliott[/name]
[name]Fernando[/name]
[name]Finnegan[/name]
[name]Forrester[/name]
[name]Hosea[/name]
[name]Jericho[/name]
[name]Jonathan[/name]
[name]Julius[/name]
[name]Leander[/name]
[name]Marius[/name]
[name]Montague[/name]
[name]Nicholas[/name]
[name]Roderick[/name]
[name]Samuel[/name]
[name]Theodore[/name]
[name]Timothy[/name]
[name]Tobias[/name]
[name]Xavier[/name]
[name]Zachariah[/name]
Pick some that you like and we’ll make more suggestions in a similar vein.
[name]Love[/name] [name]William[/name]! Very handsome and regal with down to earth middle names [name]Will[/name] and [name]Liam[/name].
I like something distinctive or uncommon with [name]William[/name] since [name]William[/name] is such a classic:
[name]William[/name] [name]Conrad[/name]
[name]William[/name] [name]Jude[/name]
[name]William[/name] [name]Blaise[/name]
[name]William[/name] [name]Bennett[/name]
[name]William[/name] [name]Dexter[/name]
[name]William[/name] [name]Barnaby[/name]
[name]William[/name] [name]Sinclair[/name]
[name]William[/name] [name]Fletcher[/name]
[name]William[/name] [name]Atticus[/name]
[name]William[/name] [name]Rhys[/name]
[name]William[/name] [name]Felix[/name]
[name]William[/name] [name]Graham[/name]
[name]William[/name] [name]Oliver[/name]
[name]William[/name] [name]Elias[/name]
[name]William[/name] [name]Sebastian[/name]
[name]William[/name] [name]August[/name]
[name]William[/name] [name]Cole[/name]
[name]William[/name] [name]Dmitri[/name]/[name]Demetri[/name]
[name]William[/name] [name]Evander[/name]
[name]William[/name] [name]Frazier[/name]
[name]William[/name] [name]Henry[/name]
[name]William[/name] [name]Jacoby[/name]/[name]Jacobi[/name]
[name]William[/name] [name]Lysander[/name]
[name]William[/name] [name]Maverick[/name]
[name]William[/name] [name]Nathaniel[/name]
[name]William[/name] [name]Paxton[/name]/[name]Pax[/name]
[name]William[/name] [name]Quinn[/name]
[name]William[/name] [name]Raphael[/name]
[name]William[/name] [name]Tate[/name]
[name]William[/name] [name]Vaughn[/name]
[name]William[/name] [name]Xavier[/name]
[name]William[/name] [name]Finch[/name]
[name]William[/name] [name]Alistair[/name]
[name]William[/name] [name]Augustus[/name]
[name]William[/name] [name]Pierce[/name]
[name]William[/name] [name]Rafferty[/name]
[name]William[/name] [name]Sterling[/name]
[name]William[/name] [name]Cyrus[/name]
[name]William[/name] [name]Leander[/name]
I really like [name]William[/name] [name]Rafferty[/name] and [name]William[/name] [name]Atticus[/name].
other ideas-
[name]William[/name] [name]Thaddeus[/name]
[name]William[/name] [name]Leopold[/name]
William Alistair
William Gareth
William Chandler
William Dashiell
Great ideas, thanks! Here’s a few I like mentioned above to help narrow down my tastes:
[name]Jude[/name]
[name]Tobias[/name]
[name]Atticus[/name]
[name]Pax[/name]
What’s the general theory on syllables I keep hearing about? 3 vs. 1 for the middle name, etc. I haven’t really heard of this before.
Either 3 syllables or 1 would sound nice and make the name flow better. The only thing people will generally tell you to stay away from are names with all the same syllable (in your case 2-2-2 because of his first and last name) because adding a bit of variety often enhances the overall sound. In your case I really like [name]William[/name] [name]Tobias[/name], and my second choice would be [name]William[/name] [name]Jude[/name]. Good luck! =]