Shalom Chris, from Be'er Sheva! If they are indeed firing Katyusha rockets from Gaza now, I am in range! You make the statement, "Pity you don`t say why you call it by this name." If I understand your question correctly, you want to know why the Russian rockets are called "Katyusha". The answer is that these rockets were invented during WW2 by the Russians. The inventor called them "Katyusha" after his wife. It reminds me of the line in the movie "Armegeddon" with Bruce Willis. When the guy found the asteroid comming to Earth, he wanted to name it Dottie, after his wife, a life sucking B**ch from which there is no escape.
U.S. approves possible sale of $5.4 billion in missiles to Saudi Arabia (Reuters)
from the article: IDF says Hamas responsible for Katyusha fired from Gaza Strip