For those with kids whose first name ends in the same letter/sound as the last name begins…
[name_f]Do[/name_f] you have any regrets or is it not a big deal? Are you happy you stuck with your favorite name even with that double sound?
Examples:
[name_u]Liam[/name_u] [name_m]Morrison[/name_m]
[name_u]Hudson[/name_u] [name_m]Knight[/name_m]
[name_u]Hayes[/name_u] [name_m]Simmons[/name_m]
[name_f]My[/name_f] kids don’t have names like this, but truly I would never even notice this on a real person!
I like your names! But I do feel like I need to pause before saying the last name to make it flow better. [name_m]Just[/name_m] saying it fast, I did notice.
Maybe say the names quickly and see if it bothers you. I also think certain combos are more difficult than others (i.e. the -s to s- example).
I don’t have kids, but I’ve met people with names such as those you list and have never really thought about it. The -s S- ones are maybe the harder ones to say though?
I think it’s just fine!
I know people named N0elle L0gan, J@ck C0bb, Th0mas Sm!th, Fel!x Se@r, so many people with A-ending first names paired with A-beginning lasts …and I’m sure I know more that haven’t even registered to me as having a name like these, with blended sounds.
[name_f]Ginger[/name_f] [name_m]Rogers[/name_m] got on well enough, and her name was chosen especially. 
It kind of bothers me so I personally avoid it - but I don’t think it’s really a big problem unless it makes it sound like a different name. Like with your examples - [name_u]Liam[/name_u] [name_m]Morrison[/name_m] isn’t great because it could be mistaken for [name_f]Lia[/name_f] / [name_f]Leah[/name_f] [name_m]Morrison[/name_m], but since Hudso and Haye aren’t names, [name_u]Hudson[/name_u] [name_m]Knight[/name_m] and [name_u]Hayes[/name_u] [name_m]Simmons[/name_m] are probably fine.
I don’t have kids (and may never by choice), but I am quite picky about this, but with middles.
One of my double barrelled name is Aria-Amala. Normally -A A- come out weirdly for me. Like Aria-Hamala/ Ariay-Amala/Aria-Ramala. (Aria-Amala isn’t actually said weirdly. It’s just an example). Sometimes the first syllable of the middle name would end up sounding breathy.
[name_f]Julia[/name_f] [name_f]Anna[/name_f] would be an example. [name_f]Anna[/name_f] [name_f]Amabel[/name_f] is another. Is probably depends on how long syllables are.
-ee ee- name are fine (Ottilie Evie)
None of my children have this, but when we were choosing their names this was never even a consideration. It wouldn’t bother me at all if it was the case. If we’d have loved a name that ended with the same letter as the start of the last name, we’d still have used that name.
I think it largely depends on the name combo! I think for many, I wouldn’t even notice (like the ones you listed). Especially if it’s easy to tell what each name is even when running them together, I think it’s fine.
I know my parents wanted to name my brother [name_m]Caleb[/name_m] [name_m]Barnum[/name_m], but they felt like when it was said fast, people might mistake his name for [name_f]Kayla[/name_f] [name_m]Barnes[/name_m]. I only think that’s a problem when either the first or last name could sound like another name if one of its sounds was taken off.