Like how many syllables the first/middle names should usually be depending on the last name?
(Mainly for one-syllable last names. But I’m curious about others as well!)
It’s really about emphasis and vowel sounds, not syllable count. Having said that, I find alternating emphasis more appealing, so with a one-syllable last name, you’ll want at least a two-syllable first name.
[name]Elle[/name] [name]James[/name] vs. [name]Ella[/name] [name]James[/name].
We broke the rules with our daughter - all her names are 2 syllables - but I actually think her name ‘works’. In general I like alternating numbers of syllables.
If you have a one syllable surname definitely do what Celianne said and consider at least a two syllable first name
That being said, at school I knew a girl called [name]Kate[/name] [name]Hill[/name] which doesn’t sound dreadful.
[name]One[/name] syllable fn/ln combos can sound very striking, but they can also sound cartoonish. [name]Luke[/name] [name]Shaw[/name] works, [name]Sean[/name] [name]Shaw[/name] doesn’t - it depends on the name. I have [name]George[/name] on my list and OH has a one syllable surname and it works fine, but I’ve removed [name]Gus[/name] because it doesn’t.
If I did a1-1 name, I would use a much longer middle for flow. But rules are made to be broken 
My daughter is 3-2-2 and my son will be 2-2-2. I really think it depends on the names and where the emphasis/accent is on the syllables.
There are only preferences, not rules.
I’ve read that first name, middle name, and last name should all have different numbers of syllables, for example 3-1-2 or 2-3-1. The exception, in my opinion, is 2-2-2, which usually seems to work. But I agree with pp’s in that the sounds and accents of the names are more important for the flow than the actual number of syllables.
Why don’t you look at number 2?
Or, take a glance at number 13?
[name]Mae[/name] [name]West[/name] sounds fine 1-1. So does [name]Faith[/name] [name]Hill[/name]. Or [name]James[/name] [name]Dean[/name], [name]John[/name] [name]Brown[/name], [name]Hugh[/name] [name]Grant[/name]…?
It really depends on what the names are.
But I like a lot of long first names so I would probably take the chance to balance out the last name with a 3-4 syllable first.
I have a 3 syllable last name and I’m not sure 3-3 or 4-3 works all that well. Though there are some combos I rather like. I just would not, for either of us, go 1-1-1 or 3-3-3, but rather pop either a long one in the middle for you or a short one in the middle for me.