we need guild requirements added to the game!

If you set your guild to private, random people cannot simply join your guild.

Then, it will be up to you (or whomever is in charge of recruitment) to find potential members.
You, the guild leader & officers can list whatever minimums you want and only choose people that meet those requirements.

My guild, as an example, we have a few minimums, 10+ million GP, 4+ GLs, 2+ GL ships and being able to deploy in TB without constant reminders. (Come on people, it takes 10 SECONDS to deploy for Sith's sake.)

I admit, that last one (in my guild) needs to be enforced a bit more forcefully, but it will be up to you to maintain whatever standards you deem important.

If you have alert officers, it isn’t a problem 

I understand why you are asking for this, but do you think it would be in any way practical to have some of the criteria you suggested written into the guild joining code?

”has changed their name once”, in particular, is a granular request that sounds like something almost no guild would want to be a selectable criteria. For instance, I’ve changed my in-game name twice. Once to add the “MINI” prefix as thousands of others did, and once again to remove it. Would I not be able to join your guild? Maybe you wouldn’t want me, but I’d have thought 13M GP with 8 GLs would tick most boxes, irrespective of a name change. 

it was just an example, a gp requirement would probably be enough. tbh tho anyone who hasn't changed their name most likely will not be a good member (speaking from experience). i've kicked 3 mol's in 1 1/2 days already, one for mia the other two for not meeting our requirements which are plainly written in our guild description.
when it comes to making the guild invite only,most players will not take the time to message as they want to join a guild right then and there.
a gp requirement check box (like the make guild private box) would help out all guilds and relieve all recruiters a little bit.