I'd seriously consider using
Alastor, simply because it closely resembles
Alastair, though I know there is no connection.
Hector would be good: it has pleasant Scottish links in my family.
Linus is more closely associated with Peanuts than Greek mythology, but perhaps this connection is fading: do namers still know about the little boy and his blanket?
For a daughter,
Penelope wins hands down. Every time I see the name
Pegasus, I think of Peggy-Sue, but that's a long way from reality, alas.