Pascal, Euclid, Ada - any other languages from the Algol family named after mathematicians? Probably stopped after Wirth himself deviated from the "pattern".
Not in the Algol family: Haskell
In the Algol (indeed Euclid) family: Turing
As yet vaporware(?): Noether
[0] generally, anyway: AWK is infamous; and I have some suspicions about CPL and MCPL ... once may be coincidence, but twice? Also, what about Popplestone's POP-n languages? ... and the "Wolfram Language" should be no surprise to anyone who's read the eponym's book.
Alice, Babbage, Curry, Dylan, Eiffel, FAUST, Gödel, Hume, Idris, Joule, Karel, Lua, Mercury, Nemmerle, Orwell, Python, Sather, Turing, WATFOR, Yorick, and Zeno to my understanding all named after people, groups of people, companies, gods, etc.
Then there are others besides Wolfram Language named after one or more contributors, like awk.
There are animals, plants, and gemstones - Zebra, Ant, Perl, the older Pearl, Ruby, Crystal, Elm, Oak, Maple (to represent Canadians, so kind of a two-fer), Emerald, Cobra, Mouse...
I don't know that anything is peculiar to the Modula family here.
Note the language itself is highly influenced by Modula-3 and ABC. ABC was a form of Basic not to many people remember these days that among its features had significant leading whitespace for statement grouping. So you can't blame/credit Guido entirely for that one.
Moreover, it was the first programming language where the implicit value of a pointer was the address contained by it and an explicit operator was used to access the pointed object (in the previous language with pointers, CPL, they behaved like the references of C++, i.e. their implicit value was the pointed object).
Unlike in C, where due to a design error the "*" indirection operator is a prefix operator, in Euler the indirection operator (which was a middle dot) was rightly a postfix operator (this was later inherited by Pascal).
Of course, Euler also had the "address of" operator ("@" in Euler, as a prefix operator), which is needed to assign values to pointers.
With ESPOL/NEWP probably being the first one with unsafe code blocks.