Not sure it's a trope, but this really bugs me: Character names in fantasy novels that are just real names with a single letter changed.
GRRM is a bugger for that - the Game of Thrones novels are full of them.
Eddard / Edward
Joffrey / Jeffrey
Jaime / Jamie
Petyr / Peter
Kevan / Kevin
Gregor / Gregory
It's just lazy.
I don't mind it too much. So many names have various off-shoots that are basically just the same name with a few letters changed; even in a medieval-style world like Game of Thrones, there would probably be all kinds of variations circulating. Historical records are kind of choked with people with the same name; it's not too surprising that they might be choked with people who have the same name, but only with a few letters altered. It was a while before people started being really creative with baby names. Whether that's a good thing or a bad thing is your call.
I find it more irritating when they give you a name that's basically just consonants and apostrophes and you're like, "How the heck am I supposed to pronounce this?" Or the kind of inconsistencies seen in the Eragon series, where the ordinary characters have names like Sloan or Elain, but the superspeschul hero has something completely out of tone with established naming conventions, like the titular character himself.
I'm okay with some creativity, but at the same time, there should be some internal consistency to fantasy names, like if they are part of the lower class, they may limit themselves to short, two syllable names, while higher classes give themselves elaborate, elongated ones proclaiming their greatness. You can break said rule by having, using the example I've given, someone from the lower class give their child a long name or someone higher up giving their child a short name, but you better have some reason why said character would do that and not just "Character knew from birth that Baby was going to be the Superspeschul Hero and therefore needed a name that would have him/her stand out from their peers and call attention to this fact."
GRRM is consistent with the names listed. All the names you've listed, at least you can believe they describe characters living together in roughly the same area/culture. From that standpoint, they make sense rather than having one character be named Will, another, Jeyne, and another, aoseitra;owrihjg.
If you're setting a fantasy story in a low-tech or a pseudo-medieval world, then I'm afraid you can only be so creative when it comes to naming conventions. To use GRRM as an example, he does do this somewhat when it comes to the Targaryeans. While there are a lot of Aegons, there are other names, but you can tell they fit the Targaryaen template because they usually have either "ae" in them, like Daneaerys or Rhaegar or Aemon, but sometimes they have the "ys" ending in them as well, like Viserys and or Rhaenys. A nice subtle convention that immediately lets you know, even before you reach the surname, that these are Targaryaens. From there, you have a generally idea of their background/appearance.
Thing is, GRRM can come up with some great names when he wants to (Sansa, Daenerys, etc.). But a lot of the time he just phones it in.
