[name_m]Hi[/name_m] there.
Here are my thoughts-
Mae-I like [name_f]Mae[/name_f]. I prefer [name_f]May[/name_f] for some reason, because it just looks more complete. But I don’t love the flow of [name_f]Mae[/name_f] [name_u]Hayden[/name_u] if that’s a big deal for you.
Juliet-Ooh, pretty. [name_f]Juliet[/name_f] [name_u]Hayden[/name_u] sounds good. [name_f]Juliet[/name_f] is just the right amount of romantic but still light. Fairly well known, but not too over done.
Lila-Lila [name_u]Hayden[/name_u] sounds good. [name_f]Lila[/name_f] is simple & feminine w/out being frilly. I like [name_f]Lila[/name_f] [name_f]Belle[/name_f].
Claire-Claire [name_u]Hayden[/name_u] flows really well. [name_f]Claire[/name_f] is nice & polished & simple. It doesn’t overly excite me, but it’s a good name. I like [name_f]Claire[/name_f] [name_f]Adeline[/name_f].
Clara-I like this a bit more than [name_f]Claire[/name_f]. It feels slightly more bookish in a really good way! And it feels more classic. Both about the same popularity, I think. I like the combo of [name_f]Clara[/name_f] [name_f]Mae[/name_f].
Violet-I like [name_f]Violet[/name_f]. It’s pretty & vintage & a little quirky. [name_f]Violet[/name_f] [name_u]Hayden[/name_u] sounds nice enough. I like [name_f]Violet[/name_f] [name_f]Isobel[/name_f] a lot.
Zoe-Zoe is okay. It’s really kind of trendy & over done, so has lost its sparkle a bit.
Wren-I want to like this. It’s a cool bird name, but I just don’t like the sound of it. [name_f]Nor[/name_f] do I think that it flows perfectly w/Hayden. But it’s not awful.
Elle-I’m not a fan of just [name_f]Elle[/name_f]. It feels too short. So many nice long ‘Elle’ names to maybe use [name_f]Elle[/name_f] as a nn for.
Rosalie-Aw, I like [name_f]Rosalie[/name_f]. It’s cheerful & old fashioned. It has the great nn of [name_f]Rosie[/name_f] too. [name_f]Rosalie[/name_f] [name_u]Hayden[/name_u] is perfect.
Iris-I don’t know. I don’t like the sound of [name_f]Iris[/name_f] that much. I like that it’s a flower & that it’s old fashioned. I just don’t think that it sounds that pretty.
Nina-Meh, I don’t know why I don’t love this one, but maybe it feels too 90s or something?
Rose-Ooh, very nice. I like [name_f]Rosalie[/name_f] slightly more, but [name_f]Rose[/name_f] does feel very polished & romantic.
Chloe-I think it’s pretty cute. It doesn’t sparkle, but it’s a pleasant name.
Noelle-Not super into this one. It feels like it should be [name_u]Noel[/name_u], but than it looks like [name_m]Nole[/name_m].
Cora-Ooh, sweet. [name_f]Vintage[/name_f] & kind & simple. [name_f]Cora[/name_f] [name_f]Mae[/name_f] is darling.
Lena-I prefer [name_f]Lena[/name_f] [name_f]Claire[/name_f]. I like this a lot, but not that much w/your ln. Plus, it can be said ‘Lay-nuh’, ‘Lenn-uh’ or ‘Lee-nuh’, & that would just be headache.
Lily-I love [name_f]Lily[/name_f]. [name_f]Lily[/name_f] [name_u]Hayden[/name_u] sounds great. It’s pretty popular, but super sweet & lovable & timeless. [name_f]Lily[/name_f] [name_f]May[/name_f] is darilng.
Nora-I like [name_f]Nora[/name_f]. It’s really popular in my area, & it’s not perfect w/Hayden. But it’s not bad. It’s a smart, simple pretty classic. [name_f]Nora[/name_f] [name_f]Mae[/name_f] is my favorite.
Eva-It’s nice. Not super exciting. [name_f]Evie[/name_f] names are sooo popular in my area too. I think that most of them are [name_u]Evelyn[/name_u], but still close. [name_f]Eva[/name_f] [name_f]Lorraine[/name_f] is kind of cute.
Liv-I love [name_f]Olive[/name_f] & [name_f]Olivia[/name_f], but just [name_f]Liv[/name_f] seems way too incomplete in my opinion.
Boys-
Malcolm-Ooh, I like it. Very handsome & fairly unique. [name_m]Malcolm[/name_m] [name_u]Joseph[/name_u] [name_u]Hayden[/name_u] sounds great.
Jake-I like [name_m]Jake[/name_m], but really prefer [name_m]Jacob[/name_m] nn [name_m]Jake[/name_m]. [name_m]Just[/name_m] [name_m]Jake[/name_m] is too nick-namey for me, & I don’t love [name_m]Jake[/name_m] [name_u]Hayden[/name_u].
Jude-Jude [name_m]Malcolm[/name_m] is very calm & handsome. But [name_u]Jude[/name_u] [name_u]Hayden[/name_u] is a bit ‘d’ heavy, I guess. Not awful.
Calvin-CalviN HaydeN isn’t perfect, but it’s fine. [name_m]Calvin[/name_m] is cute & kind of quirky. I love the nn [name_u]Cal[/name_u].
Jasper-I can’t get into [name_u]Jasper[/name_u]. Most people seem to like it, but to me t looks like the word jester. [name_m]Even[/name_m] though it’s pretty far from it!
Owen-It has the same ‘n’ problem as [name_m]Calvin[/name_m], but it’s a great name. I feel like it’s strong & masculine, but outdoorsy & gentle too.
James-James [name_u]Hayden[/name_u] doesn’t sound that awesome, but not awful. [name_u]James[/name_u] is pretty popular, but a good solid classic.
Benjamin-I don’t mind the ‘n’ ending here, because it’s three syllables & flows better. [name_u]Benjamin[/name_u] [name_u]Hayden[/name_u] sounds pretty good, but I wouldn’t do BenjamiN VaN HaydeN or BenjamiN AlaN HaydeN. I guess [name_u]Benjamin[/name_u] [name_u]Joseph[/name_u] is okay?
Cullen-This is cool. Kind of sporty & friendly & easy but different. Again, not idea w/Hayden, but okay.
Callum-I love [name_u]Callum[/name_u] [name_u]Joseph[/name_u]. I like this better than [name_m]Calvin[/name_m]. It’s better w/your ln, & it’s just a little softer but still has a sporty vibe.
Cal-Hm. I like [name_u]Callum[/name_u] (or [name_m]Calum[/name_m], kind of) nn [name_u]Cal[/name_u] better. You could always do [name_u]Charles[/name_u] nn [name_u]Cal[/name_u] too if you want another [name_u]Cal[/name_u] option.
Leo-Leo [name_u]Joseph[/name_u] [name_u]Hayden[/name_u] or [name_u]Leo[/name_u] [name_m]Malcolm[/name_m] [name_u]Hayden[/name_u] both sounds really nice. [name_u]Leo[/name_u] adorable & spunky & just the right amount of geeky. It’s getting popular, but not too bad.
Miles-It’s fine, but doesn’t excite me. Probably because it feels like half the little boys I meet are called this.
Beau-I’m not a fan of this name. It reminds me too much of ‘bro’.
Maxwell-Maxwell is adorable & I love the sporty spunky sleek nn of [name_u]Max[/name_u].
Henry-The little boys that aren’t named [name_u]Miles[/name_u] are named [name_u]Henry[/name_u]. I love [name_u]Henry[/name_u], but it’s sooo over done. And [name_u]Henry[/name_u] [name_u]Hayden[/name_u] isn’t ideal.
Theo-Theo is getting quite popular too, but it’s really cute anyway. I do personally find it a bit nick-namey on its own. I love [name_m]Theodore[/name_m].
Jonah-Jonah is sweet. Not perfect w/Hayden, but not bad. I like [name_u]Jonah[/name_u] [name_m]Malcolm[/name_m] is nice.
Lachlan-Lachlan [name_u]Joseph[/name_u] sounds great. [name_m]Lachlan[/name_m] is a great balance of sporty & gentle. And it’s not as over done as some other similar names. [name_m]Lachlan[/name_m] [name_u]Hayden[/name_u] isn’t ideal, but not bad.
Jack-I may like [name_u]Jack[/name_u] [name_m]Malcolm[/name_m] more. [name_u]Jack[/name_u] [name_u]Hayden[/name_u] sounds like a movie star. I love the sleek cheerful [name_u]Jack[/name_u].
Milo-I like this more than [name_u]Miles[/name_u]. It’s more unique than [name_u]Miles[/name_u] & just cuter. [name_u]Milo[/name_u] [name_u]Joseph[/name_u] [name_u]Hayden[/name_u] sounds perfect.
Caleb-This one doesn’t excite me that much. Not sure why. [name_m]Caleb[/name_m] [name_u]Hayden[/name_u] is a bit long ‘a’ heavy too.
Callan-I don’t like this as much as [name_m]Calvin[/name_m] or [name_u]Callum[/name_u].
[name_f]Hope[/name_f] this helps. 
this is SO cute! I love the double H alliteration!)