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Thanks to the Admiral, Bowmore's a very big name in Doskvol- it kinda makes sense you'd see it twice. They probably are related! (It's up to the GM, of course.) Besides, that's the kinda confusion that's fun. I ran a campaign where two players had someone named Flint as a connection, but described the character entirely differently. Coming up with why there were two different Flints, and revealing it as a twist later in the campaign, was a great time.

Those people are related. They're part of the powerful Bowmore family (which built Bowmore bridge) and are part of the alliance (with Rowan House and Clelland House) to take down Lord Strangford (p. 29).

All of the powerful noble families have members in positions of high power throughout the Imperium. You can safely assume that everyone with the same last name of a powerful House is related and all attend the family council meetings where they hatch horrible schemes. :)