[mikkow]

Vesper means evening or evening prayer

[tptacek]

Which is presumably where Ian Fleming got the name for Vesper Lynd, the love interest in Casino Royale, for whom the drink (a martini with gin & vodka [usually an either/or thing with a martini] and lillet insted of vermouth) is named.

[jacques_chester]

Vesper Lynd is a pun: "West Berlin", spoken with an accent.

[tptacek]

Well there you go.