罗曼尔 is a phonetic transliteration:
罗 (luó ~ 'ro') +
曼 (màn ~ 'man') +
尔 (ěr, generic foreign-name suffix for ~r/-er). It renders Romaner-style surnames; note the WWII German general Erwin Rommel is more commonly
隆美尔 (Lóngměi'ěr) in Chinese, so
罗曼尔 typically transliterates other bearers of similar-sounding names from English-language fiction or news.