汉斯乐 is a phonetic rendering of a Germanic-sounding name in the Hans-/Hansel/Hansler family:
汉斯 (Hànsī) is the standard Chinese transliteration of 'Hans', and
乐 (lè) tags on the final '-ler/-le' syllable. Used in subtitle translations of foreign characters; the exact bearer depends on the source film/book.