How to pronounce "Pei" in Japanese?

The pen name ざわ, Zawa, Romaji is usually translated as Ze, but it is put at the beginning of the word when it is pronounced さわ (Sawa).

For example, Sawada Tsunayoshi, Sawada Tsunayoshi, さわだつなよししししししししししししししししし123

But Maria Ozawa (laughs) マリぉざわマリァァぉざわァァァ