Hi Nicolau,

Yes they are. I have a small 40-page booklet on just this issue from Tan Publishers titled:

Is it a Saint's name?

Certain names are derived from others.

Alanna is derived from Alan. One of the more famous Alan's is Blessed Alanus de Rupe also known as Blessed Alan de la Roche. Here's the scoop on him:

• Alanus de Rupe (Sometimes Alain de La Roche)

Here's another Alan, Alanus, whose feast day is November 25th. Here's the scoop on him:

• Saint Alanus of Lavaur on Patron Saints Index

Although not mentioned exactly, Alison, like Alice and Alisa, is probably a derivative of Adelaide
(St. Adelaide), whose feast day is December 16th. Here's the scoop on her:

• St. Adelaide on New Advent.

Here's also a little something on Patron Saints:

• Patron Saints on New Advent.
• Patron Saints on Catholic.org
• Patron Saints from OurCatholicFaith
• Patron Saints from Saints.SQPN.com (Notes about your extended family in Heaven.)

I also found this information on another web site:

Adelaide — (Saxon)

Beautiful princess

Alanna — (Alane) (Celtic)

Comely; fair

Alison — (Teutonic)

Of sacred fame

Hope this helps,

Mike