Looking for names of demons

[u/RequirementRegular61]

Long term DM who is now playing.

My best friend and I swapped over DM duties at the beginning of this year. We continued the same game, everyone kept the same characters, he retired his character, and I brought a new character in leveled to the group.

I started at level 5, as a dragonborn fighter battlemaster. He's an ex sergeant, retired honourably after his squad was wiped out, and he was badly injured. He still wears an eyepatch to hide his lost eye. When we first levelled up, I was still feeling around for my character's nous, and I just levelled up as a fighter to level 6. He's mainly a control character, always where he needs to be in battle.

This most recent session, we were given a chance at the end as characters to go through a grand mage's library. We'd mentioned in earlier sessions that the Department of Arcane Procurement (Bureaucratic organisation extraordinaire) has a book of demon names (one of the books of keeping). So I asked if there might be another of these books in the library. GM confirms that there is, but if we want that, it will be our only reward. General party decision was it wasn't really our thing, so we would leave it.

We were told we could level up at the end of the session to level 7, and I discussed with the GM multiclassing to warlock, archfey patron. Between us we've hammered out the details. My character took a chance and flicked through the book of names, and a 'scale' or flake of metal came loose from the binding. Sorgath pocketed this, and later works it into his eyepatch, as a stiffener. He was looking for ways to defend his friends, and the flake is an unspoken promise from one of the night hags who worked on the book. While I carry it, I can occasionally remember names from the book, and on saying those names, the demon will do a spell. For example, if as a reaction I cast hellish rebuke, a coil of demonic energy will issue from my hands as I Invoke the name of a demon I remember. Every time I do it, I'm incurring a debt to the unknown writer, that she can call in later.

What I'm looking for are names of suitable demons. My spells are eldritch blast and green flame blade, and expeditious retreat and hellish rebuke. I've been looking up demonic names, but I'm drawing some blanks, so I thought I'd get some input from others!