Married couples who do not share the same last name experience higher divorce rates and generally separate sooner than those who do, according to a recent analysis by the Institute for Family Studies. The report, which examined 2023 Pew Research Center data alongside Texas divorce records, found that couples with different surnames divorce at a rate 50% higher than couples sharing a last name.

The study reveals that couples with differing last names typically divorce after eight to ten years of marriage, while those with matching surnames stay together for about 12 years on average before filing for divorce. Lyman Stone, the report’s author, suggests that couples who share more aspects of their lives—including their names—are more likely to adopt a "team first" outlook. This mindset may foster greater cooperation, trust, and a sense of a shared future.

Stone also notes that some couples who retain separate last names may have philosophical reasons for doing so, such as opposition to taking the husband's surname. However, he proposes that the group also includes spouses who entered marriage hastily or informally and did not complete the administrative processes associated with changing names. This phenomenon could partly explain why couples with different surnames might be more prone to divorce.

The report points out that the logistical difficulties surrounding name changes might influence divorce rates. The administrative burden of legally reverting to a maiden name after divorce can be substantial, possibly deterring some couples sharing a surname from ending their marriages. In other words, the prospect of additional paperwork might contribute to lower divorce rates among couples with shared last names.

Nationally, the analysis found that approximately 75% to 80% of married couples share the same last name. It also identified demographic patterns in name changing: older, white, and more conservative women were more likely to adopt their spouse’s surname. For example, about 86% of women over 50 have taken their husband's last name, compared with 74% of women under 29. Education level also plays a role, with 85% of women holding a high school diploma adopting their spouse’s name, versus 76% of college graduates.

Overall, the findings highlight the complex interplay of cultural, personal, and bureaucratic factors in marriage dynamics and suggest a correlation between shared names and marital stability, though causality remains open to interpretation.