Interesting thread as I've never thought about "thou shall not take God's name in vain" as applying to the term Holy Ghost. Though as an aspect of God it probably should. I certainly apply it to the terms Christ, Jesus and of course God. I'd ask how the application of Holy Ghost is used. Is it respectful, disrespectful or an issue that's never brought up. If you have a Christian group called "God's Children" or some such thing that's not in vain, they believe in him. As Spy in TF2 I wear a renamed Exorcizor with a sincere message about God in the hopes someone will read it. So it's possible to use an item respectfully.
If I'm being honest in a world with games that regularly openly condone, support or excuse, sexual perversion, cursing, secular humanism, criminal behavior and explicitly taking God's name in vain on a regular basis an item simply named the Holy Ghost isn't going to get much notice. I'm not saying it's wrong or right, vanity requires determining intent, only I could probably find other things in my life to cut out first that are far more influential over people's behavior, insulting to God or sinful. That said it's the right thing that you took the time to consider what God wants, don't ever stop doing that for everything, pray perpetually asking if what you are doing is right by God and if it is His will. Love Him more than anything including games. Also remember two things on any content...
1. How does it influence you? Not that which goeth into the mouth defileth a man; but that which cometh out of the mouth, this defileth a man. Matthew 15:11An item named the Holy Ghost probably isn't going to temp you into repeating His name in vain much. I mean it's possible. I remember playing Metal Gear Solid and almost said "Damn" meaninglessly as Snake kept using it. The game did influence my behavior from the shear repetition of hearing it. At that point it matters but how often are you going to read the Holy Ghost text much less use it as a vain exclamation?
2. How does it influence others? More applicable is probably 1Corinthians 8-12 Which talks about there may be no fault in one eating meat offered to idols while not believing in them but doing so can condone the behavior for those who do. For example even if you can resist the temptation to curse or say God's name in vain there are many who look at media and mimic it. If "A" makes a cool, and vulgar, one liner while killing "B" people will walk around making the same comments to garner the same attention for themselves. People could conceivably look at the name and equate it to God being meaningless or it may be without enough context to make any comparison at all.
The bottom line is there is something wrong with everything. We live in a sinful world where nothing is perfect or untouched by sin. Ask yourself if what you buy and do is profitable to God. Do you influence people in the game for Christ? Are you doing more good than harm in your playing? Does playing Battlefield 5 keep you away from your drug addiction

? At the same time never become complacent. Being imperfect there is always something we can do better. Ask Christ for forgiveness and strive to "become perfect" while accepting you will never be on your own power so you can always do better. That there are worse, or more technically influential things (as all sin separates us from God), is not an excuse to condone the lesser only that we should probably tackle the more influential things first.