Is it permissible to name a newborn "Hussein" and does it involve the "lam of emphasis (Lām at-tafkhīm)"?

There is no objection to naming someone "Husayn" without the definite article (alif and lam). There is no truth to what is rumored about the impermissibility of naming someone "Al-Husayn" with the definite article, as the grandson of the Messenger of Allah, peace and blessings be upon him, Husayn ibn Ali, may Allah be pleased with him, was named by it.