The word “tattoo” has two distinct meanings, with two distinct etymologies. The first, meaning skin art, comes from Polynesian. The second, meaning a military drumbeat, comes from the Dutch.
@grammargirl and then ther’s the little guy from Fantasy Island ;)
@grammargirl And the drumbeat meaning evolved from 'taptoe' (as it's still called in Dutch), the army trumpet signal that the day was done, like the Last Post.