When saying San or Santo, the rule is when there is a consonant followed by an O, right?

Question

(Like Domingo, Roman, or Tomas)

Answer 1

clipped this from dictionary:

san

adj. (contr. of santo used before masc. names except for Tomás, Tomé, Toribio, and Domingo)

San Martín Saint Martin see santo

feminine=Santa Barbara

From another dictionary:

2 Santo, Santa (San before names of masculine saints except those beginning with D or T)

• Alright thanks - Vince_Peña Sep 28, 2009