Generate the answer for a given question. The question requires common knowledge of English. Make sure that the answer is in detail, long, consistent with the context, and requires general knowledge of English. To be less repetitive, please vary your language for each question. Give a proper explanation to answer, and if necessary, provide the definition of various terms. And conclude your answer if it's long. If you have used other resources (e.g., Merriam Webster's.) to answer the question, include citations in your answer. You don't need to paraphrase the context of your resources, but make sure that your answer is consistent and complete.

When it comes to cities and boats named after saints, it seems that 'Santa' is always female and 'San' is always male. e.g. Male Saints: San Diego, San Francisco, San Antonio Female Saints: Santa Barbara, Santa Maria So why isn't 'Santa Claus' a woman like all the other 'Santa's?.
The city names you quote are all derived from Spanish, where 'San' (or 'Santo', as @tchrist clarifies below) is the male inflection and 'Santa' the female one. However, Santa Claus isn't derived from Spanish, but from Dutch, where it was originally rendered as Sante Klaas, and was modified to Santa when it was adopted into English (and from English, to the rest of the world). Here's Etymonline's take on it: from dialectal Dutch Sante Klaas, from Middle Dutch Sinter Niklaas 'Saint Nicholas,' English, like all other languages, borrows words from many sources, and they often carry over remnants of their original grammar or usage, even when it makes for inconsistent usage in English.

I'm trying to find different ways of saying that 'You don't have to be a rocket scientist', but I can't seem to get any good ideas. I got a variation, 'You don't have to be a brain surgeon...,' but are there any others ways. It doesn't have to follow the routine of 'You don't have to...'.
Other related expressions are: You don't have to be a genius/it doesn't take a genius: 'You don't have to be a genius. You don't have to be superman. You don't even have to be a techie. Just have an idea.' All you need is a good imagination and you'll find fertile soil. And . . . the best ideas are right under your nose. Ron Gordon ... 'I know that it doesn't take a genius to work out that sleep is important for good health.' or, you don't have to be Einstein: They graduate! So, they end up going through life with this piece of paper that makes everybody think that they are smart, even if they are not. You don't have to be Einstein to have a place in college. He was not sure he really wanted to know, though one didn't have to be Einstein to put two and two together.!!

On a Physics specification, it says: 6.7 Know how to use two permanent magnets to produce a uniform magnetic field pattern. Isn't it 'produce an uniform magnetic field', or is the existing 'produce a uniform magnetic field pattern' correct?.

The word uniform begins with a palatal approximant /j/. The palatal approximant is a consonantal sound, even though the letter itself is a vowel. Since we use the pronunciation of the word following the article to determine whether we use 'a' or 'an', and because it is pronounced starting with a consonant, we use 'a'. Thus, the original sentence is correct. Just for the sake of completeness, the letter 'u' can also have a vowel sound, such as in the word 'umbrella', which begins with an open-mid back unrounded vowel //.