A problem I often come across is what to name each incarnation of the Master.
Unlike the Doctor, the Master’s incarnations are not numbered, and different names have been used for the incarnations.
So what do you like to call them?
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The “Last Name of Actor” Master is what I go for most of the times 
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It’s standard to call them by [Actor’s last name] Master. So Ainley!Master, Delgago Master (with or without the ! is fine). The exception is Missy, who is just Missy.
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The Delgado Master
The Crispy Master
The Ainsley Master
Goop Snake Master
The Macqueen Master
The War Master
(11th Doctor Year 2 Comic Spoilers) The War Child
The Saxon Master
Missy
The Spy Master
Mostly just The ‘Last Name of Actor’ Master, with a few exceptions
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Pretty much what @JayPea said. If we ever get another female Master, we’ll probably start calling Missy the “Gomez Missy”.
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The Dreyfus Master
The Delgado Master
Either The Crispy Master or Beevers Master
The Ainley Master
The Eric Roberts Master or TV Movie Master
The Macqueen Master
The War Master
The Saxon Master
Missy
The Lumiat
The Spy Master
The Unbound Master or Gatiss Master
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I also hear “The Tremas Master” for Ainley relatively often.
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I don’t know why but using “The Spy Master” instead of Dhawan Master makes me grind my teeth.
I have a bit of the same with “Saxon Master” instead of Simm Master, but not as strongly…
Really no idea why, but that might annoy me even more than the term NuWho does…
Why am I being Mr Grumpy Pants this evening? 
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Delgado
Queimadinho
Ainley but chato dos infernos works too
Roberts
McQueen
War
Simms
Missy
Sacha or Spy
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The day started with you stealing your wife’s mug.
And it went downhill from there.
Here we are, with Grumpy Uncle Bill now!
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Delgado Master
Crispy or Decayed Master
Ainley Master
Bruce Master
Bald Master
War Master
Saxon Master
Missy
Spy Master
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Might as well admit that I kind of think of Delgado as just “The Master”, and figure the others are the ones that need something to distinguish them from him…
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tardis.wiki hates this one trick
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To be fair, if you just go by actor surname, what happens when you get comic/novel original masters?
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The [Introductory Story] Master? Idk. Haven’t considered it.
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11th Doctor Year Two Comic Spoilers
The ‘War Child’ Master’s first appearence is in The Then and The Now, but he doesn’t get dialogue until much later, and then isn’t revealed to be The Master until even later
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The… uh… [Story in which it was revealed that this character was the Master] Master?
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We need another incarnation then so we can call them the Then Master and the Now Master
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If we have The Master, what happened to The Mast and The Mastest?
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Oh no I really dislike using actor surnames sorry but that’s not in-universe.
See the website for how I like to categorise them 
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