Well, there is no right or wrong safeword, although it’s smart that you have word for a “slow up” and another for “stop”, and if gagged/bound, something you do to signify both (i.e. blink 3 times, etc).
Personally, I think his name would be fine if you never use it and call him Daddy or Sir in bed. Saying “pineapple” or something like that always seemed a bit mood-killing when I’ve imagined people using that; “red” and “yellow” or something like that seems a bit more natural.
I imagine hearing my name would make me stop. Either way you need to discuss it ahead of time. Obviously, this is just my opinion, man.
Thanks for the Ask.