In a way, the rightness or wrongness of Mr. Lechmere, long dead, who gave his name to a square that gave its name to the BERy stop at the end of the East Cambridge Viaduct, is not really the point. The names of things and places are for us now, not for people in the past. If a substantial number of people are unhappy when they hear the name Lechmere, then change the name for that reason, especially if, as is likely, very few people would really mind not hearing the name Lechmere. If more people think of the station as being in East Cambridge than as being in Lechmere Square, then change the name for that reason. It doesn't help or hurt Mr. Lechmere either way. And since the largest number of people probably don't even think about whether there was a person named Lechmere (at my age, I think of the old store first, but if someone had told me it was named after a lake in England I'd have believed it), it's probably not a big deal either way and can hardly be said to be keeping historical memories alive. (Different from Mr. Yawkey, for example, who was all the good and bad things that he was in living memory and whose way was very clearly named in his honor.)