皮耶尔 transliterates the French name Pierre. The more common Mainland rendering is 皮埃尔 (Pí'āi'ěr); 皮耶尔 is a Taiwan/Hong Kong variant. Tolstoy's character Pierre Bezukhov in《战争与和平》(War and Peace) is usually 皮埃尔.
memory
皮 pí ('Pi-') + 耶 yē ('-ye-') + 尔 ěr ('-rre' soft r). 耶 (yē, as in Jesus 耶稣) often signals a soft '-ye-' or '-er-' sound in transliterations.