Nam previously oversaw Samsung Heavy's shipyard in Geoje, South Korea.
The shipbuilder last Wednesday forecast a fourth straight year of operating losses and announced a rights issue to lessen the risk of tighter credit conditions, prompting a near 30 percent slide in its shares after the announcement.
The company's $1.4 billion new share issue, which follows a $1 billion issue in 2016, will be used to pay debt as well as to reduce the risk of banks curtailing lending due to its weak earnings prospects, Samsung Heavy said in a statement last week.
South Korea's three shipbuilders — the world's biggest — have racked up billions of dollars in losses and embarked on major restructuring as customers slashed orders amid a commodities downturn and a drop-off in shipping trade. They also have to fend off stiff competition from Chinese and Japanese rivals.
Samsung Heavy — the smallest of the three — said in a filing it expected an operating loss of 240 billion won ($220 million) in the next financial year, after an expected loss of 490 billion won this year — the result of weak orders and a failure to reach its targets to cut headcount and other costs.
Shares of Samsung Heavy have since recovered, inching by around 2 percent on Monday at 9:45am HK/SIN.