If "Momo" is your name, and if it is pronounced the way it looks, it is a very easy name for English native speakers to pronounce, and it sounds pretty.
In the United States we are used to people using all kinds of first names. Furthermore, especially for girls, it is common and acceptable for parents simply to invent names.
I've never met anyone named Momo in the US, but I just did a Google search on the name "Momo Smith" and got many relevant hits! In fact, here is a letter dated 1909 from Momo Smith, Selma Alabama, to Waring Huston. In other words, I think "Momo" is already a US name or nickname, although it is a very rare one.
If you really want an English name, "Mona" is an English name. In fact it is commoner in England than it is in the United States, so it is literally English! Like "Momo," it is two syllables long and contains a long "O" sound.
Your name (or maybe just your username) Momo is not only easy to pronounce, but also sounds very cute.
But you can also play with the idea of finding a name that you find suitable for your personality, your interests and values.
Check this link for names and meanings: