Whatever you decide to call your boat do the MayDay test first.
That is how does it sound in an emergency
situation, can it be understood over a radio
to someone for whom English
is not their first language, can it be misunderstood or mis-interpreted.
The Admiral and I had considered some Gaelic names for our boat but when it came time to actually say them over a radio
we thought better of it as we didn't want to be spelling it every time.
Both your suggestions work but "Slowin Stedy" would be one of those you might end up having to spell all the time.
Just my thoughts, however you name it is up to you. Important thing is though to enjoy