i have a name that ends in yud key and once was asked to sign a tanaim at a wedding, the mesader kedushin, a rosh yeshiva, requested that the two of us practice our names on a napkin so i wrote it with a dash, he told me that it wasn’t necessary and to make sure i didn’t do that on the actual tanaim.
I also believe I once heard a story where someone sent a question to Rav Kanievsky regarding writing a name that contains a shem Hashem. The Rav wrote back a letter that only contained his signature.