Adam, Yiddish originated in central and eastern Europe and was a melding of primarily German and Hebrew and eastern European languages. It came to Israel and the US and is spoken in those countries, but it is not related to English. Ladino is another example of a dialect developed by Jews living, in this case, in Spain and melding Hebrew and old Spanish. When the Jews were expelled from Spain they took Ladino with them to many other countries in the Mediterranean region and incorporated words from those languages as well. Personally, I grew up speaking high German and Hebrew, and worked with many Orthodox Jews who spoke primarily Yiddish. We were able to communicate because I could figure out what they were saying. In return, I learned a lot of great Yiddish expressions. It's a very rich and flavorful language.
English has influenced modern Hebrew a lot, so I guess that it does come from english, although it might have originated from Yiddish, which has also influenced modern Hebrew and is related to english, but I don't speak Yiddish, so i'll have to wait for someone who speaks Yiddish to confirm this.