Array#fill を使います。
girls = %w(まどか さやか)
#=> ["まどか", "さやか"]
girls.dup.fill(girls.length...5) { '杏子' }
#=> ["まどか", "さやか", "杏子", "杏子", "杏子"]
dup を外せば、レシーバを直接書き換えます。
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