Nicknames in the currency market are not standardised, and several pairs carry more than one. USD/JPY is variously the gopher, the ninja, or just dollar-yen. Some brokers' internal systems still use the older codes.
The practical point is not the name but the behaviour. Dollar-yen tends to track the US 10-year Treasury yield closely, because the yield gap determines how attractive it is to hold dollars against a historically low-yielding yen.
Example: the US 10-year yield rises from 4.10% to 4.35% over two weeks and USD/JPY rises from 150.20 to 153.40. That is roughly 13 pips of yen weakness per basis point of yield.
Related: ninja, interest-rate-differential, carry-trade