Lots of people pick lots of patron saints. Occupational saints, local saints, saints of the parish, saints of your birthday, saints of your name-day… and saints you just like, or who seem to be giving you hints now and then.
So no, you didn’t miss out!
Re: St. Sarah – Obviously, Sarah the wife of Abraham is the original St. Sarah! (Her feast day is on August 19 or October 9, depending on the calendar used.)
But there are quite a few others. There are a lot of different spellings, including “Sara” and “Sarra.” One of the more recent ones is
Blessed Sara Salkahazi, a Hungarian lady who spoke out against the Nazis and died a martyr.
One of the older ones is St. Sarah the abbess, an early Christian and nun from the famous Egyptian monastic settlement of Skete, out in the desert. She is considered one of the “Desert Mothers.” (Here’s a page
showing her icon.)
And of course, you probably already know that “Sarah” comes from the Hebrew for “female ruler” or “princess”, from the verb “sarar”, to rule. (“Sar” is a prince or male ruler.)