Since [name]Frederick[/name] is 3 syllables, I would go for a one or two syllable first name. Of course, alot depends on how many syllables you have in your surname too!
These were suggestions I liked from my other post.
[name]Leo[/name]
[name]Oliver[/name]
[name]Miles[/name]
[name]Charles[/name] ([name]Charlie[/name])
[name]Edward[/name]
[name]Owen[/name]
[name]James[/name] ([name]Jamie[/name])
[name]Louis[/name]/[name]Lewis[/name]
[name]Dashiell[/name] ([name]Dash[/name])
[name]Mischa[/name]: Our last name is Hoffmann. So 2 syllables…
[name]Dean[/name] [name]Frederick[/name]
[name]Theo[/name] [name]Frederic[/name]
[name]Leo[/name] [name]Frederick[/name]
[name]Jasper[/name] [name]Frederick[/name]
[name]Eli[/name] [name]Frederick[/name]
[name]James[/name] [name]Frederick[/name]
[name]Declan[/name] [name]Frederick[/name]