This Sur La Table White Ramekin (Custard Cup) from their “Every Day Porcelain” line tested negative for lead in the white glazed surface and positive for trace levels of lead (at just 36 ppm) on the unglazed bottom exterior surface. This was purchased new in late 2015/early 2016 and tested in 2016. Testing was done with an XRF instrument. This product was marked as “Made in China”.
This trace amount of lead is not at a level that would be considered an added ingredient and is also considered safe by all standards.
Here are some links* to comparable choices available on Amazon today, that are also likely to be lead-safe or lead-free. I have not tested each these exact products but as they are new and very similar to many of those that I have tested [and the choices below are not from brands I avoid!], they are likely good choices.
My preferred choice (clear glass):
6 oz. set of 4 ramekins.