Behind every couple name CoupleForge generates is a small piece of pattern-finding that happens in about half a second. When you type two names, the algorithm scans each one for vowel boundaries — the natural seams where syllables break — and tries dozens of ways to recombine the pieces. Brad and Angelina has its first natural seam after the 'a' in Brad and after the 'A' in Angelina. Cut there, recombine, and you get Brangelina. The same thing happens for your names, just with twelve different recombinations rather than the one that history happened to remember.
Each candidate is scored for pronounceability — whether vowels and consonants alternate the way they would in a name you'd actually say out loud, whether the syllable count lands in the celebrity-portmanteau sweet spot (six to ten letters), and whether the name preserves enough of both originals that it still sounds like you two, not a random word. The top twelve come back ranked.
The hashtag generator works the other direction — it starts from a library of formulas that wedding photographers and Pinterest archivists have been collecting for two decades, then fills in your specifics: last name, first name, blended name, vibe words, date. Fifty options in less time than it takes to spell-check one.