Question: what is the origin of the name marvin
[{'answer': 'Welsh', 'provenance': [{'wikipedia_id': '12028219', 'title': 'Marvin (name)', 'start_paragraph_id': 1, 'start_character': 46, 'end_paragraph_id': 1, 'end_character': 51, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'the Welsh name Mervyn', 'provenance': [{'wikipedia_id': '12028219', 'title': 'Marvin (name)', 'start_paragraph_id': 1, 'start_character': 42, 'end_paragraph_id': 1, 'end_character': 63, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'derived from the Welsh name Mervyn'}, {'provenance': [{'wikipedia_id': '12028219', 'title': 'Marvin (name)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 120, 'bleu_score': 0.9181891462193901, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14977350230441117889}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '12028219', 'title': 'Marvin (name)', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14977350230441117889}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '12028219', 'title': 'Marvin (name)', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['Marvin is a male given name, derived from the Welsh name Mervyn. It is also found as a surname. Marven is a variant form.', 'Marvin is a male given name, derived from the Welsh name Mervyn.', 'Marvin is a male given name, derived from the Welsh name Mervyn. It is also found as a surname. Marven is a variant form.']}}]}]