For one who davens in English, is it OK to say the name of Hashem as “L-rd” or ” G-d”?
(Some, including Rav Moshe Sternbuch, say that “L-rd” is problematic or even completely unacceptable, but it says in the Artscroll siddur that it’s OK.)
Yes, both are acceptable. L-rd is a translation of the Name of Ad – nai, which means the Ruler and Lord over everything.
See Igros Moshe 4:40:27 who discusses the issue of translating Hashem’s name into other languages.