No info yet
No favorite names yet.
I'm 95% sure that there isn't an Olympic swimmer named Ford River Grace, and there definitely isn't a world record holder in the 400 IM by that name. The current world record holders in the 400 IM are Ye Shiwen (women), Katinka Hosszu (women's short course), Michael Phelps (men), and Ryan Lochte (men's short course). The American men to hold the world record in the 400 IM going back to the 80s are Michael Phelps, Tom Dolan, and David Wharton in long course and only Ryan Lochte in short course. The only American women to hold the world record in the 400 IM since 1980 are Katie Holt (long course) and Julia Smit (short course).
Given that, I'm guessing that this isn't a real post. If it is, hc1543, you don't need to make up fake accomplishments for the regular posters here to take you seriously!
My initials are MP, and it's never bothered me. Nobody has ever brought up Military Police or Member of Parliament (although I'm American, so MP = Member of Parliament isn't in daily use around me). I was one of those kids who was going to be teased no matter what my name was, and was teased using my first name (despite it being very common for my age group), and yet nobody has ever even mentioned that my initials can be used as an abbreviation.
My sister's initials are HP, and, as far as I know, that's never been a problem for her. I've never made the connection between her initials and the company HP, despite being familiar with the company.
Of the others you mentioned, the only two I'd possibly avoid are PP and TP. The meanings of AP, IP, and KP seem as unlikely to come up as the meanings of MP. The companies BP and HP have about equal exposure in my mind, so if HP's never been an issue for my sister then I don't see BP being an issue, either.
Karen -> Katen
Peter -> Theter
Keep: Isolde Katherine
Switch: Rose Genevieve
Change Middle: Cassia Diane
Change First: Martha Elise
Keep Initials: Abigail Jessamine
Keep: Paul Andrew
Switch: Martin Thomas
Change Middle: Arthur Nathaniel
Change First: Christopher Lionel
Keep Initials: Matthew Benjamin
Since no one else has commented, I'll give it a shot. Other posters are much better at this than I am, so hopefully one of them will chime in soon.
From your "liked" section:
Although I like all three, Theodore, Henry, August, Quentin, and maybe Benedict all seem a bit "tame" compared to Maximus.
Would Julius, Augustus, or Aurelius make you feel locked into a Roman theme, and would you be okay with that?
Jericho, Dante, and Quillan/Quillian don't fit well with Maximus to me. My only association with Jericho is the Biblical city, so it doesn't feel like a person's name to me. Dante has always felt sort of informal to me, for reasons I've never been able to pin down. Not like a nickname, but also not grand like Maximus. Quillan and Quillian both feel like modern invented names (I'm not saying they are, just that without doing research, that would be my impression of the them). Of the two, I'd favor Quillan because the second "i" in Quillian gets lost in "l"s a bit.
Leonidas doesn't feel any more "too much" to me than Constantine, Augustus, Aurelius, or Maximus.
I'm not confident in my pronunciation of Riordan.
I think my favorites in this group with Maximus are Leopold/Leonidas, Constantine, Evander, and Raphael. For middles, I'd lean toward Theodore, Henry, August, Quentin, and Benedict with Leopold/Leonidas or Constantine because I like the balance of giving a tamer middle. With Evander or Raphael I'd lean toward Barnaby, because I like the idea of using a family name.
Of the perhaps group:
Aleron, Davian/Davion, Jorian, Jotham, and Mavery all feel like modern invented names to me. I have no idea if they are, but that would be my first impression.
Maverick doesn't feel like a person's name, although I know it is used as one. It feels strange enough with Maximus to me that I'd wonder about siblings named Maverick and Maximus.
The pronunciation of Simeon is uncomfortably close to simian for me.
I'm never sure how to pronounce Joaquin.
Conan is the barbarian. I've never seen a Conan the barbarian movie/tv show (I'm not even sure which he has - both? only movies? only tv?) or read any of the books, and that's still an overwhelming association for me. A distant second is the late night talk show host (whose show I've never watched).
Aldrich or Leandro are my favorites with Maximus of this group.
Malcolm (b) and Audrey (g)
Keep: Leah Rosamund
Switch: Stella Jessamine
Change middle: Lavinia Marguerite
Change first: Julia Ellen
Keep initials: Marina Ruth
Keep: Jonathan Peter
Switch: Alexander James
Change middle: Theodore Philip
Change first: Joseph Frederick
Keep initials: Samuel Martin
Deanna => Beanna
Lincoln => Zincoln
Colleen --> Zolleem
Boris --> Noris
I like Caspian, Emeric, or Octavian best of your current list. They all fit well with Astrid to me, in that they're unusual and have a bit of weight to them, but are still easy to pronounce. Octavian might be a bit long for everyday use (although I do know Elizabeths who go by their full name successfully), but EVie had some great suggestions for nicknames.
August and Lysander are alright, but don't quite feel like they fit with Astrid to me. August feels too normal, and Lysander feels too light.
I'd worry about pronounciation with both Loic and Soren. Soren looks easy, but I have a vague memory of being told that I was pronouncing it wrong and not being able to get the correct pronunciation. Loic is much harder, because of the accent mark. Accent marks are very intimidating to me, to the point that I hesitate to even try to pronounce names that include them.
Remy feels very much like a nickname to me. I know that it's not, but I can't get rid of that impression.
I can't comment on Ambrose. I had a friend in high school who used it as a joke name, and I can't get past that association to get a more general sense for the name.
Ginger (g), Ivy (g), Laurel (g), Kenny (b), Rusty (b), Lucy (g), Tad(b),
and Cole (b)
What about Lettie as a nickname for Violet? I went to high school with a Letitia who was usually called Lettie. It reminds me of Lottie, which seems to be well-liked as a nickname for Charlotte.
I'm going to disagree with previous posters. Ad-a-lyn seems perfectly natural for Adeline to me, by analogy with Madeline and Caroline, both of which I've heard pronounced lyn as or more frequently than line.
Ginger (g) and Ivy (g)
Graham(b) Elspeth (g), Vaughn (b), Alistair (b), Maeve (g), Fiona (g), Cormac (b), Declan (b), Brenna (g), and
Graham (b), Elspeth (g),
and Vaughn (b).
Temperance (g), Journey (g), Clarity (g), Peregrine (b), Flint (b), Autumn (g), Maverick (b), Storm (b)
and Lark (g)
Huh, I've never thought of the replacing Cs with Ks trend as being particularly new. I thought it was already a fairly mainstream trend in the 70s/80s?