There are many HOECKs in the Chicago Area. I use to be one of them. I have just a minor amount of genelogical data on the HOECKs. Let me share with you.
My great grandparents were: Jens Peter Hoeck (b.1861 Location: Denmark - d. 1938 Location: Chicago ) Mary Madsen(b.18?? Location: unknown - d. 1903 Location: Chicago )
The only thing I know about my great grandparents is that he had an older brother with the same name that died as a child. I've no information about other siblings.
My grandparents were: Clarence Peter Hoeck (b. 22 June 1898 Location: Chicago - d. 08 June 1941 Location: Chicago ) Bessie Thompson Sim (b. 16 September 1897 Location: Chicago - d. 20 January 1969 Location: Chicago )
I know that my grandfather had a sister: Pearl Hoeck but I've no further information on her or if there were other siblings. My grandparents had only two children: my Aunt: Mary Jane Hoeck Beyer and my Father: Clarence James Hoeck. I'll be going back to visit soon. If I uncover anything else that might aid you, I'll post it.