Does seem pretty damned uncanny.
Ofc, the Tinanic could have named (maybe consciously , or maybe unconsciously) by somebody who'd read the book. That would explain the similarity in the names. I would imagine that April is the most likely month for a passenger ship to strike an iceberg. An awful lot could be explained by the author's extensive knowlede of the shipping industry, just as he said,
But both ships sank 720km from Newfoundand?
I do suspect clairvoyance here. Why not? But, then, I'm already convinced that clairvoyance does occur. To paraphrase another author , I don't think time works quite the way we think it does.